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1

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Phase-matching mechanism for high-photon-energy harmonics of a long trajectory driven by a midinfrared laser (2012)

Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-09

Description: Author(s): Cheng Gong, Jiaming Jiang, Chuang Li, Liwei Song, Zhinan Zeng, Jing Miao, Xiaochun Ge, Yinghui Zheng, Ruxin Li, and Zhizhan Xu High-order harmonics were generated with neon gas by using 12-fs midinfrared laser pulses with stabilized carrier-envelope phase (CEP). At some specific CEP, a broad “supercontinuum” of the extreme ultraviolet spectrum can be obtained. Two distinct continuous spectral regimes are found by numerical ... [Phys. Rev. A 85, 033410] Published Thu Mar 08, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Effects of photon momentum in nonrelativistic (γ,2e) processes (2012)

A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): A. G. Galstyan, O. Chuluunbaatar, Yu. V. Popov, and B. Piraux We study the effects of nonzero photon momentum on the triply differential cross section (TDCS) for ( γ ,2 e ) processes. Due to the low value of the photon momentum, these effects are weak and manifest only in special kinematical conditions such as the back-to-back emission of the electrons with equal ... [Phys. Rev. A 85, 023418] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evaporation-limited loading of an atomic trap (2012)

Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Markus Falkenau, Valentin V. Volchkov, Jahn Rührig, Hannes Gorniaczyk, and Axel Griesmaier Recently, we have experimentally demonstrated a continuous loading mechanism for an optical dipole trap from a guided atomic beam [ M. Falkenau, V. V. Volchkov, J. Rührig, A. Griesmaier and T. Pfau Phys. Rev. Lett. 106 163002 (2011) ]. The observed evolution of the number of atoms and temperature in... [Phys. Rev. A 85, 023412] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dynamics of D_{3}^{+} slow dissociation induced by intense ultrashort laser pulses (2012)

B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): B. Gaire, J. McKenna, M. Zohrabi, K. D. Carnes, B. D. Esry, and I. Ben-Itzhak The dissociation of D 3 + in intense ultrashort laser pulses is investigated using an improved coincidence three-dimensional momentum imaging method that allows clear separation of all fragmentation channels and the determination of the kinetic energy release down to zero. Our results, using 10-fs, 79... [Phys. Rev. A 85, 023419] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Theoretical study of angular-resolved two-photon ionization of H_{2} (2012)

Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Ph. V. Demekhin, B. M. Lagutin, and I. D. Petrov Cross sections and angular distribution parameters of electrons ejected via two-photon ionization of the hydrogen molecule by linearly and circularly polarized light are computed in the exciting-photon energy range of 8–14 eV, which covers the first four optical resonant states of the molecule. Phot... [Phys. Rev. A 85, 023416] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Optimized maximum-confidence discrimination of N mixed quantum states and application to symmetric states (2012)

Ulrike Herzog

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Ulrike Herzog We study an optimized measurement which discriminates N mixed quantum states occurring with given prior probabilities. The measurement yields the maximum achievable confidence for each of the N conclusive outcomes, thereby keeping the overall probability of inconclusive outcomes as small as possible... [Phys. Rev. A 85, 032312] Published Mon Mar 12, 2012

Keywords: Quantum information

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Possibility of magic trapping of a three-level system for Rydberg blockade implementation (2012)

Muir J. Morrison and Andrei Derevianko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Muir J. Morrison and Andrei Derevianko The Rydberg blockade mechanism has shown noteworthy promise for scalable quantum computation with neutral atoms. Both qubit states and gate-mediating Rydberg state belong to the same optically trapped atom. The trapping fields, while being essential, induce detrimental decoherence. Here we theoretic... [Phys. Rev. A 85, 033414] Published Mon Mar 12, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantum key distribution with delayed privacy amplification and its application to the security proof of a two-way deterministic protocol (2012)

Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai Privacy amplification (PA) is an essential postprocessing step in quantum key distribution (QKD) for removing any information an eavesdropper may have on the final secret key. In this paper, we consider delaying PA of the final key after its use in one-time pad encryption and prove its security. We ... [Phys. Rev. A 85, 032308] Published Fri Mar 09, 2012

Keywords: Quantum information

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Solution of the time-dependent Dirac equation for multiphoton ionization of highly charged hydrogenlike ions (2012)

Yulian V. Vanne and Alejandro Saenz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): Yulian V. Vanne and Alejandro Saenz A theoretical study of the intense-field multiphoton ionization of hydrogenlike systems is performed by solving the time-dependent Dirac equation within the dipole approximation. It is shown that the velocity-gauge results agree to the ones in the length gauge only if the negative-energy states are ... [Phys. Rev. A 85, 033411] Published Fri Mar 09, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantum repeaters based on heralded qubit amplifiers (2012)

Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard We present a quantum repeater scheme based on the recently proposed qubit amplifier [ N. Gisin, S. Pironio and N. Sangouard Phys. Rev. Lett. 105 070501 (2010) ]. It relies on an on-demand entangled-photon-pair source which uses on-demand single-photon sources, linear optical elements, and atomic ens... [Phys. Rev. A 85, 032313] Published Tue Mar 13, 2012

Keywords: Quantum information

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Analytic theory of high-order-harmonic generation by an intense few-cycle laser pulse (2012)

M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): M. V. Frolov, N. L. Manakov, A. M. Popov, O. V. Tikhonova, E. A. Volkova, A. A. Silaev, N. V. Vvedenskii, and Anthony F. Starace We present a theoretical model for describing the interaction of an electron, weakly bound in a short-range potential, with an intense, few-cycle laser pulse. General definitions for the differential probability of above-threshold ionization and for the yield of high-order-harmonic generation (HHG) ... [Phys. Rev. A 85, 033416] Published Tue Mar 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Experimental studies of partial photodetachment cross sections in K^{−} below the K(7 ^{2}P) threshold (2012)

A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp A collinear beams apparatus has been used to determine photodetachment cross sections for K − in the photon energy range 4.250–4.360 eV. State-selective detection, utilizing a resonance ionization scheme, was applied to measure partial cross sections for those channels which leave the residual K atom... [Phys. Rev. A 85, 033415] Published Tue Mar 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Phase transitions for random states and a semicircle law for the partial transpose (2012)

Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye For a system of N identical particles in a random pure state, there is a threshold k 0 = k 0 ( N )∼ N /5 such that two subsystems of k particles each typically share entanglement if k 〉 k 0 , and typically do not share entanglement if k 〈 k 0 . By “random” we mean here uniformly distributed on the sphere of th... [Phys. Rev. A 85, 030302] Published Mon Mar 12, 2012

Keywords: Quantum information

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Barycentric measure of quantum entanglement (2012)

Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski Majorana representation of quantum states by a constellation of n “stars” (points on the sphere) can be used to describe any pure state of a simple system of dimension n +1 or a permutation symmetric pure state of a composite system consisting of n qubits. We analyze the variance of the distribution ... [Phys. Rev. A 85, 032314] Published Wed Mar 14, 2012

Keywords: Quantum information

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Completeness of classical φ^{4} theory on two-dimensional lattices (2012)

Vahid Karimipour and Mohammad Hossein Zarei

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vahid Karimipour and Mohammad Hossein Zarei We formulate a quantum formalism for the statistical mechanical models of discretized field theories on lattices and then show that the discrete version of φ 4 theory on 2D square lattice is complete in the sense that the partition function of any other discretized scalar field theory on an arbitrary... [Phys. Rev. A 85, 032316] Published Wed Mar 14, 2012

Keywords: Quantum information

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Algorithmic approach to simulate Hamiltonian dynamics and an NMR simulation of quantum state transfer (2012)

Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta We propose an iterative algorithm to simulate the dynamics generated by any n -qubit Hamiltonian. The simulation entails decomposing the unitary time evolution operator U (unitary) into a product of different time-step unitaries. The algorithm product-decomposes U in a chosen operator basis by identi... [Phys. Rev. A 85, 030303] Published Wed Mar 14, 2012

Keywords: Quantum information

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Thermally generated long-lived quantum correlations for two atoms trapped in fiber-coupled cavities (2012)

Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag A theoretical model for driving a two-qubit system to a stable long-lived entanglement is discussed. The entire system is represented by two atoms, initially in ground states and disentangled, each one coupled to a separate cavity with the cavities connected by a fiber. The cavities and fiber exchan... [Phys. Rev. A 85, 032315] Published Wed Mar 14, 2012

Keywords: Quantum information

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Low-rank positive-partial-transpose states and their relation to product vectors (2012)

Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid Deciding whether a mixed quantum state is separable or entangled is a difficult problem in general. Separable states are positive under partial transposition [they are positive-partial-transpose (PPT) states], but this simple test does not exclude all entangled states. In order to understand the ent... [Phys. Rev. A 85, 022309] Published Mon Feb 06, 2012

Keywords: Quantum information

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High-fidelity quantum gates in the presence of dispersion (2012)

B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm We numerically demonstrate the control of motional degrees of freedom of an ensemble of neutral atoms in an optical lattice with a shallow trapping potential. Taking into account the range of quasimomenta across different Brillouin zones results in an ensemble whose members effectively have inhomoge... [Phys. Rev. A 85, 022306] Published Mon Feb 06, 2012

Keywords: Quantum information

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Back-action of a driven nonlinear resonator on a superconducting qubit (2012)

Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-05

Description: Author(s): Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais We study the backaction of a driven nonlinear resonator on a multilevel superconducting qubit. Using unitary transformations on the multilevel Jaynes-Cummings Hamiltonian and quantum optics master equation, we derive an analytical model that goes beyond linear response theory. Within the limits of v... [Phys. Rev. A 85, 022305] Published Fri Feb 03, 2012

Keywords: Quantum information

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Bose-Einstein condensate as a quantum memory for a photonic polarization qubit (2012)

Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr A scheme based on electromagnetically induced transparency is used to store light in a Bose-Einstein condensate. In this process, a photonic polarization qubit is stored in atomic Zeeman states. The performance of the storage process is characterized and optimized. The average process fidelity is 1.... [Phys. Rev. A 85, 022318] Published Mon Feb 13, 2012

Keywords: Quantum information

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22

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Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules (2012)

Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Wei-Chao Jiang, Oleg I. Tolstikhin, Liang-You Peng, and Qihuang Gong The physical origin and properties of quasistationary static-field-induced states (SFISs) are discussed. SFISs can be supported by a combination of any atomic or molecular potential and an external static electric field and do not have counterparts in the absence of the field. A resonant tunneling i... [Phys. Rev. A 85, 023404] Published Mon Feb 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Tight lower bound to the geometric measure of quantum discord (2012)

Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag Dakic, Vedral, and Brukner [ B. Dakic, V. Vedral and Č. Brukner Phys. Rev. Lett. 105 190502 (2010) ] gave a geometric measure of quantum discord in a bipartite quantum state as the distance of the state from the closest classical quantum (or zero discord) state and derived an explicit formula for a ... [Phys. Rev. A 85, 024302] Published Mon Feb 13, 2012

Keywords: Quantum information

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Phase dependence of dynamical manipulation of NaI predissociation (2012)

Yuanxing Liu, Yunquan Liu, and Qihuang Gong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Yuanxing Liu, Yunquan Liu, and Qihuang Gong We propose a dynamic pump-control scheme to manipulate the molecular predissociation process of NaI using two color few-cycle laser pulses. We excite the NaI molecule with a pump pulse (648 nm, 35 fs) and employ another control laser pulse (7.53 μm, 50 fs) to modify the molecular potential energy su... [Phys. Rev. A 85, 023406] Published Tue Feb 14, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Adiabaticity in the lateral electron-momentum distribution after strong-field ionization (2012)

Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Jost Henkel, Manfred Lein, Volker Engel, and Ingo Dreissigacker By solving the time-dependent Schrödinger equation for atoms in short laser pulses of different polarizations, it is shown that in strong-field ionization without rescattering, the lateral width of the electron-momentum distribution corresponds adiabatically to the instantaneous laser field on a sub... [Phys. Rev. A 85, 021402] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Atom slowing via dispersive optical interactions (2012)

M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): M. Hamamda, M. Boustimi, F. Correia, J. Baudon, T. Taillandier-Loize, G. Dutier, F. Perales, and M. Ducloy A promising technique of atom slowing is proposed. It is based upon the dispersive interaction of atoms with optical potential pulses generated by a far-off-resonance standing wave modulated in time. Each pulse reduces the velocity by a small amount. By repeating the process thousands of times, the ... [Phys. Rev. A 85, 023417] Published Tue Feb 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Entanglement and area laws in weakly correlated Gaussian states (2012)

J. M. Matera, R. Rossignoli, and N. Canosa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): J. M. Matera, R. Rossignoli, and N. Canosa We examine the evaluation of entanglement measures in weakly correlated Gaussian states. It is shown that they can be expressed in terms of the singular values of a particular block of the generalized contraction matrix. This result enables us to obtain in a simple way asymptotic expressions and rel... [Phys. Rev. A 86, 062324] Published Wed Dec 26, 2012

Keywords: Quantum information

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Imperfect measurement settings: Implications for quantum state tomography and entanglement witnesses (2012)

Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang Reliable and well-characterized quantum resources are indispensable ingredients in quantum information processing. Typically, in a realistic characterization of these resources, apparatuses come with intrinsic uncertainties that can manifest themselves in the form of systematic errors. While systema... [Phys. Rev. A 86, 062325] Published Wed Dec 26, 2012

Keywords: Quantum information

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Influence of multiple ionization thresholds on harmonic generation from Ar^{+} (2012)

A. C. Brown and H. W. van der Hart

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): A. C. Brown and H. W. van der Hart We apply time-dependent R -matrix theory to investigate harmonic generation from ground-state Ar + with M =0 at a wavelength of 390 nm. Contributions associated with the different 3 s 2 3 p 4 ionization thresholds are assessed, including the interference between these. The dominant contribution originates f... [Phys. Rev. A 86, 063416] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Optimal-control theory of harmonic generation (2012)

Ido Schaefer and Ronnie Kosloff

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Ido Schaefer and Ronnie Kosloff Coherent control of harmonic generation was studied theoretically. A specific harmonic order was targeted. An optimal control theory was employed to find the driving field where restrictions were imposed on the frequency band. Additional restrictions were added to suppress undesired outcomes, such a... [Phys. Rev. A 86, 063417] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Excitation of Rydberg wave packets with chirped laser pulses (2012)

J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): J. Preclíková, M. Kozák, D. Fregenal, Ø. Frette, B. Hamre, B. T. Hjertaker, J. P. Hansen, and L. Kocbach We study Rydberg wave packets produced by pairs of time separated femtosecond laser pulses. The time separation ranges from femtosecond to picosecond time scales. The wave packets consist predominantly of f states of principal quantum numbers n =22–32 in Li. With a direct analysis of the field ioniza... [Phys. Rev. A 86, 063418] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Evidence of sympathetic cooling of Na^{+} ions by a Na magneto-optical trap in a hybrid trap (2012)

I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): I. Sivarajah, D. S. Goodman, J. E. Wells, F. A. Narducci, and W. W. Smith A hybrid ion-neutral trap provides an ideal system to study collisional dynamics between ions and neutral atoms. This system provides a general cooling method that can be applied to species that do not have optically accessible transitions and can also potentially cool internal degrees of freedom. T... [Phys. Rev. A 86, 063419] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Enhancing photoassociation rates by nonresonant-light control of shape resonances (2012)

Rosario González-Férez and Christiane P. Koch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Rosario González-Férez and Christiane P. Koch Photoassociation, assembling molecules from atoms using laser light, is limited by the low density of atom pairs at sufficiently short interatomic separations. Here we show that nonresonant light with intensities of the order of 10 10 W/cm 2 modifies the thermal cloud of atoms, enhancing the Boltzmann... [Phys. Rev. A 86, 063420] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Hybrid model for Rydberg gases including exact two-body correlations (2012)

Kilian P. Heeg, Martin Gärttner, and Jörg Evers

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Kilian P. Heeg, Martin Gärttner, and Jörg Evers A model for the simulation of ensembles of laser-driven Rydberg-Rydberg interacting multilevel atoms is discussed. Our hybrid approach combines an exact two-body treatment of nearby atom pairs with an effective approximate treatment for spatially separated pairs. We propose an optimized evolution eq... [Phys. Rev. A 86, 063421] Published Wed Dec 26, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Gaussian postselection and virtual noiseless amplification in continuous-variable quantum key distribution (2012)

Jaromír Fiurášek and Nicolas J. Cerf

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Jaromír Fiurášek and Nicolas J. Cerf Noiseless amplification or attenuation are two heralded filtering operations that enable amplifying or de-amplifying a quantum state of light with no added noise, at the cost of a small success probability. We show that inserting such noiseless operations in a transmission line improves the performa... [Phys. Rev. A 86, 060302] Published Wed Dec 26, 2012

Keywords: Quantum information

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Attosecond time-delay spectroscopy of the hydrogen molecule (2012)

I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): I. A. Ivanov, A. S. Kheifets, and Vladislav V. Serov We apply the concept of photoemission time delay to the process of single-photon one-electron ionization of the H 2 molecule. We demonstrate that, by resolving the photoelectron detection in time on the attosecond scale, one can extract differential photoionization cross sections for particular field... [Phys. Rev. A 86, 063422] Published Thu Dec 27, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Diagrammatic approach to attosecond delays in photoionization (2012)

J. M. Dahlström, T. Carette, and E. Lindroth

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): J. M. Dahlström, T. Carette, and E. Lindroth We study laser-assisted photoionization by attosecond pulses using a time-independent formalism based on diagrammatic many-body perturbation theory. Our aim is to provide an ab initio route to the “delays” for this above-threshold ionization process, which is essential for a quantitative understandi... [Phys. Rev. A 86, 061402] Published Thu Dec 27, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Robust adaptive measurement scheme for qubit-state preparation (2012)

Saki Tanaka and Naoki Yamamoto

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): Saki Tanaka and Naoki Yamamoto In this paper, the method of adaptive measurement for qubit-state preparation developed by Jacobs is reconsidered, and an alternative scheme that works even under unknown unitary evolution of the state is shown. The key idea is that the measurement is adaptively changed so that one of the eigenstate... [Phys. Rev. A 86, 062331] Published Thu Dec 27, 2012

Keywords: Quantum information

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Qubit-qudit states with positive partial transpose (2012)

Lin Chen and Dragomir Ž. Đoković

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): Lin Chen and Dragomir Ž. Đoković We show that the length of a qubit-qutrit separable state is equal to max( r , s ), where r is the rank of the state and s the rank of its partial transpose. We refer to the ordered pair ( r , s ) as the birank of this state. We also construct examples of qubit-qutrit separable states of any feasible birank... [Phys. Rev. A 86, 062332] Published Thu Dec 27, 2012

Keywords: Quantum information

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Directional spinning of molecules with sequences of femtosecond pulses (2012)

C. Bloomquist, S. Zhdanovich, A. A. Milner, and V. Milner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-20

Description: Author(s): C. Bloomquist, S. Zhdanovich, A. A. Milner, and V. Milner We present an analysis of two experimental approaches to controlling the directionality of molecular rotation with ultrashort laser pulses. The two methods are based on the molecular interaction with either a pair of pulses (a “double-kick” scheme) or a longer pulse sequence (a “chiral-pulse-train” ... [Phys. Rev. A 86, 063413] Published Wed Dec 19, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantifying the noise of a quantum channel by noise addition (2012)

A. De Pasquale and V. Giovannetti

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-03

Description: Author(s): A. De Pasquale and V. Giovannetti In this paper we introduce a way to quantify the noise level associated to a given quantum transformation. The key mechanism lying at the heart of the proposal is noise addition : in other words we compute the amount of extra noise we need to add to the system through convex combination with a refere... [Phys. Rev. A 86, 052302] Published Thu Nov 01, 2012

Keywords: Quantum information

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Strongly entangled light from planar microcavities (2012)

D. Pagel, H. Fehske, J. Sperling, and W. Vogel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-10

Description: Author(s): D. Pagel, H. Fehske, J. Sperling, and W. Vogel The emission of entangled light from planar semiconductor microcavities is studied and the entanglement properties are analyzed and quantified. Phase matching of the intracavity scattering dynamics for multiple pump beams or pulses, together with the coupling to external radiation, leads to the emis... [Phys. Rev. A 86, 052313] Published Fri Nov 09, 2012

Keywords: Quantum information

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High-fidelity entanglement purification using chains of atoms and optical cavities (2012)

Denis Gonţa and Peter van Loock

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-10

Description: Author(s): Denis Gonţa and Peter van Loock In our previous paper [D. Gonţa and P. van Loock, Phys. Rev. A 84 042303 (2011) ], we proposed an efficient scheme to purify dynamically a bipartite entangled state using short chains of atoms coupled to high-finesse optical cavities. In contrast to conventional entanglement purification protocols,... [Phys. Rev. A 86, 052312] Published Fri Nov 09, 2012

Keywords: Quantum information

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Time-energy analysis of above-threshold ionization in few-cycle laser pulses (2012)

L. Guo, S. S. Han, and J. Chen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-14

Description: Author(s): L. Guo, S. S. Han, and J. Chen A Wigner-distribution-like (WDL) function is used to study the time-energy distribution of a photoelectron emitted from an atom in few-cycle laser fields with different frequencies. The WDL function shows the dependence of ionization probability on time and explicitly demonstrates the transition of ... [Phys. Rev. A 86, 053409] Published Tue Nov 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantum dissonance is rejected in an overlap measurement scheme (2012)

Chang-shui Yu, Jun Zhang, and Heng Fan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-14

Description: Author(s): Chang-shui Yu, Jun Zhang, and Heng Fan The overlap measurement scheme accomplishes the evaluation of the overlap of two input quantum states by only measuring an introduced auxiliary qubit, irrespective of the complexity of the two input states. We find a counterintuitive phenomenon that no quantum dissonance can be found in the process ... [Phys. Rev. A 86, 052317] Published Tue Nov 13, 2012

Keywords: Quantum information

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Demonstration of active feedforward one-way quantum computing with photon-matter hyperentanglement (2012)

Xiao-Fan Xu, Xiao-Hui Bao, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-14

Description: Author(s): Xiao-Fan Xu, Xiao-Hui Bao, and Jian-Wei Pan We report an optical one-way quantum computing experiment with stationary quantum memory involved. First we create a hybrid four-qubit cluster state with two qubits propagating as photons and the other two stationary and stored in a laser-cooled atomic-ensemble quantum memory, and characterize it wi... [Phys. Rev. A 86, 050304] Published Tue Nov 13, 2012

Keywords: Quantum information

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Quantum search using non-Hermitian adiabatic evolution (2012)

Alexander I. Nesterov and Gennady P. Berman

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-13

Description: Author(s): Alexander I. Nesterov and Gennady P. Berman We propose a non-Hermitian quantum annealing algorithm which can be useful for solving complex optimization problems. We demonstrate our approach on Grover's problem [ L. K. Grover Phys. Rev. Lett. 79 325 (1997) ] of finding a marked item inside of an unsorted database. We show that the energy gap b... [Phys. Rev. A 86, 052316] Published Mon Nov 12, 2012

Keywords: Quantum information

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Genuinely multipartite concurrence of N-qubit X matrices (2012)

S. M. Hashemi Rafsanjani, M. Huber, C. J. Broadbent, and J. H. Eberly

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-06

Description: Author(s): S. M. Hashemi Rafsanjani, M. Huber, C. J. Broadbent, and J. H. Eberly We find an algebraic formula for the N -partite concurrence of N qubits in an X matrix. X matrices are density matrices whose only nonzero elements are diagonal or antidiagonal when written in an orthonormal basis. We use our formula to study the dynamics of the N -partite entanglement of N remote qub... [Phys. Rev. A 86, 062303] Published Wed Dec 05, 2012

Keywords: Quantum information

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Valence-shell single photoionization of Kr^{+} ions: Experiment and theory (2012)

G. Hinojosa, A. M. Covington, G. A. Alna'Washi, M. Lu, R. A. Phaneuf, M. M. Sant'Anna, C. Cisneros, I. Álvarez, A. Aguilar, A. L. D. Kilcoyne, A. S. Schlachter, C. P. Ballance, and B. M. McLaughlin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-06

Description: Author(s): G. Hinojosa, A. M. Covington, G. A. Alna'Washi, M. Lu, R. A. Phaneuf, M. M. Sant'Anna, C. Cisneros, I. Álvarez, A. Aguilar, A. L. D. Kilcoyne, A. S. Schlachter, C. P. Ballance, and B. M. McLaughlin Photoionization of Kr + ions was studied in the energy range from 23.3 to 39.0 eV at a photon energy resolution of 7.5 meV. Absolute measurements were performed by merging beams of Kr + ions and of monochromatized synchrotron undulator radiation. Photoionization (PI) of this Br-like ion is characteriz... [Phys. Rev. A 86, 063402] Published Wed Dec 05, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Exploring the tradeoff between fidelity and time optimal control of quantum unitary transformations (2012)

Katharine W. Moore Tibbetts, Constantin Brif, Matthew D. Grace, Ashley Donovan, David L. Hocker, Tak-San Ho, Re-Bing Wu, and Herschel Rabitz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-13

Description: Author(s): Katharine W. Moore Tibbetts, Constantin Brif, Matthew D. Grace, Ashley Donovan, David L. Hocker, Tak-San Ho, Re-Bing Wu, and Herschel Rabitz Generating a unitary transformation in the shortest possible time is of practical importance to quantum information processing because it helps to reduce decoherence effects and improve robustness to additive control field noise. Many analytical and numerical studies have identified the minimum time... [Phys. Rev. A 86, 062309] Published Wed Dec 12, 2012

Keywords: Quantum information

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Detecting entanglement with partial state information (2012)

Federico M. Spedalieri

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-14

Description: Author(s): Federico M. Spedalieri We introduce a sequence of numerical tests that can determine the entanglement or separability of a state even when there is not enough information to completely determine its density matrix. Given partial information about the state in the form of linear constraints on the density matrix, the seque... [Phys. Rev. A 86, 062311] Published Thu Dec 13, 2012

Keywords: Quantum information

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Weak randomness seriously limits the security of quantum key distribution (2012)

Jan Bouda, Matej Pivoluska, Martin Plesch, and Colin Wilmott

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-14

Description: Author(s): Jan Bouda, Matej Pivoluska, Martin Plesch, and Colin Wilmott In usual security proofs of quantum protocols the adversary (Eve) is expected to have full control over any quantum communication between any communicating parties (Alice and Bob). Eve is also expected to have full access to an authenticated classical channel between Alice and Bob. Unconditional sec... [Phys. Rev. A 86, 062308] Published Fri Dec 07, 2012

Keywords: Quantum information

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Dynamical invariants for quantum control of four-level systems (2012)

Utkan Güngördü, Yidun Wan, Mohammad Ali Fasihi, and Mikio Nakahara

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-15

Description: Author(s): Utkan Güngördü, Yidun Wan, Mohammad Ali Fasihi, and Mikio Nakahara We present a Lie-algebraic classification and detailed construction of the dynamical invariants, also known as Lewis-Riesenfeld invariants, of the four-level systems including two-qubit systems which are most relevant and sufficiently general for quantum control and computation. These invariants not... [Phys. Rev. A 86, 062312] Published Fri Dec 14, 2012

Keywords: Quantum information

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Theory of attosecond transient-absorption spectroscopy of krypton for overlapping pump and probe pulses (2012)

Stefan Pabst, Arina Sytcheva, Antoine Moulet, Adrian Wirth, Eleftherios Goulielmakis, and Robin Santra

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-18

Description: Author(s): Stefan Pabst, Arina Sytcheva, Antoine Moulet, Adrian Wirth, Eleftherios Goulielmakis, and Robin Santra We present a fully ab initio calculations for attosecond transient absorption spectroscopy of atomic krypton with overlapping pump and probe pulses. Within the time-dependent configuration interaction singles (TDCIS) approach, we describe the pump step (strong-field ionization using a near-infrared ... [Phys. Rev. A 86, 063411] Published Mon Dec 17, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Single-site addressing of ultracold atoms beyond the diffraction limit via position-dependent adiabatic passage (2012)

D. Viscor, J. L. Rubio, G. Birkl, J. Mompart, and V. Ahufinger

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-18

Description: Author(s): D. Viscor, J. L. Rubio, G. Birkl, J. Mompart, and V. Ahufinger We propose a single-site addressing implementation based on the subwavelength localization via adiabatic passage (SLAP) technique. We consider a sample of ultracold neutral atoms loaded into a two-dimensional optical lattice with one atom per site. Each atom is modeled by a three-level Λ system in i... [Phys. Rev. A 86, 063409] Published Mon Dec 17, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Coherent intense resonant laser pulses lead to interference in the time domain seen in the spectrum of the emitted particles (2012)

Philipp V. Demekhin and Lorenz S. Cederbaum

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-18

Description: Author(s): Philipp V. Demekhin and Lorenz S. Cederbaum The dynamics of atomic levels resonantly coupled by a coherent and intense short high-frequency laser pulse is discussed and it is advocated that this dynamics is sensitively probed by measuring the spectra of the particles emitted. It is demonstrated that the time envelope of this laser pulse gives... [Phys. Rev. A 86, 063412] Published Mon Dec 17, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Quantum network coding for quantum repeaters (2012)

Takahiko Satoh, François Le Gall, and Hiroshi Imai

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-25

Description: Author(s): Takahiko Satoh, François Le Gall, and Hiroshi Imai This paper considers quantum network coding, which is a recent technique that enables quantum information to be sent on complex networks at higher rates than straightforward routing strategies. Kobayashi et al. have recently showed the potential of this technique by demonstrating how any classical n... [Phys. Rev. A 86, 032331] Published Mon Sep 24, 2012

Keywords: Quantum information

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Experimental observation of quantum correlations in modular variables (2012)

M. A. D. Carvalho, J. Ferraz, G. F. Borges, P.-L de Assis, S. Pádua, and S. P. Walborn

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-25

Description: Author(s): M. A. D. Carvalho, J. Ferraz, G. F. Borges, P.-L de Assis, S. Pádua, and S. P. Walborn We experimentally detect entanglement in modular position and momentum variables of photon pairs which have passed through D -slit apertures. We first employ an entanglement criteria recently proposed in [ Phys. Rev. Lett. 106 210501 (2011) ], using variances of the modular variables. We then propose... [Phys. Rev. A 86, 032332] Published Mon Sep 24, 2012

Keywords: Quantum information

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Anomalous external-magnetic-field dependence of dephasing in a spin bath (2012)

Rui Li

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-25

Description: Author(s): Rui Li We theoretically investigate the dephasing of a central spin-1 model. An interesting mechanism of spin decoherence is found with this model, namely, hyperfine mediated spectral diffusion . This mechanism contains the features of both the dipolar-interactions-induced spectral diffusion and the hyperfi... [Phys. Rev. A 86, 032333] Published Mon Sep 24, 2012

Keywords: Quantum information

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Measurements of intense ultrafast laser-driven D_{3}^{+} fragmentation dynamics (2012)

A. M. Sayler, J. McKenna, B. Gaire, Nora G. Kling, K. D. Carnes, and I. Ben-Itzhak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-25

Description: Author(s): A. M. Sayler, J. McKenna, B. Gaire, Nora G. Kling, K. D. Carnes, and I. Ben-Itzhak Experiments on the triatomic hydrogen molecular ion in intense ultrashort laser pulses are important for understanding the fundamentals of polyatomic molecular dynamics and for providing a benchmark for theory. Here we extend our earlier measurements [ Phys. Rev. Lett. 103 103004 (2009) ] to provide... [Phys. Rev. A 86, 033425] Published Mon Sep 24, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Investigation of the generation of high-order harmonics through Bohmian trajectories (2012)

Yang Song, Fu-Ming Guo, Su-Yu Li, Ji-Gen Chen, Si-Liang Zeng, and Yu-Jun Yang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-25

Description: Author(s): Yang Song, Fu-Ming Guo, Su-Yu Li, Ji-Gen Chen, Si-Liang Zeng, and Yu-Jun Yang We theoretically investigated the generation progress of high-order harmonics utilizing Bohmian trajectories, which are calculated from the accurate numerical wave function. It is found that the harmonic emission spectrum from atoms in an intense laser field calculated by Bohmian trajectories agrees... [Phys. Rev. A 86, 033424] Published Mon Sep 24, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Intrinsic phonon effects on analog quantum simulators with ultracold trapped ions (2012)

C.-C. Joseph Wang and J. K. Freericks

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-22

Description: Author(s): C.-C. Joseph Wang and J. K. Freericks Linear Paul traps have been used recently to simulate the transverse-field Ising model with long-range spin-spin couplings. We study the intrinsic effects of phonon creation (from the initial phonon ground state) on the spin-state probability and spin entanglement for such quantum spin simulators. W... [Phys. Rev. A 86, 032329] Published Fri Sep 21, 2012

Keywords: Quantum information

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T_{1}-echo sequence: Protecting the state of a qubit in the presence of coherent interaction (2012)

Clemens Müller, Alexander Shnirman, and Martin Weides

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-26

Description: Author(s): Clemens Müller, Alexander Shnirman, and Martin Weides We propose a sequence of pulses intended to preserve the state of a qubit in the presence of strong, coherent coupling to another quantum system. The sequence can be understood as a generalized swap sequence and works in formal analogy to the well-known spin echo. Since the resulting effective decoh... [Phys. Rev. A 86, 032335] Published Tue Sep 25, 2012

Keywords: Quantum information

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Partial separability revisited: Necessary and sufficient criteria (2012)

Szilárd Szalay and Zoltán Kökényesi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-28

Description: Author(s): Szilárd Szalay and Zoltán Kökényesi We extend the classification of mixed states of quantum systems composed of arbitrary numbers of subsystems of arbitrary dimensions. This extended classification is complete in the sense of partial separability and gives 1+18+1 partial separability classes in the tripartite case contrary to a former... [Phys. Rev. A 86, 032341] Published Thu Sep 27, 2012

Keywords: Quantum information

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Quantum state discrimination with general figures of merit (2012)

Won-Young Hwang and Yeong-Deok Han

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-28

Description: Author(s): Won-Young Hwang and Yeong-Deok Han We solve the problem of quantum state discrimination with “general (symmetric) figures of merit” for an even number of symmetric quantum bits with use of the no-signaling principle. It turns out that conditional probability has the same form for any figure of merit. Optimal measurement and correspon... [Phys. Rev. A 86, 032339] Published Thu Sep 27, 2012

Keywords: Quantum information

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Orientation of doubly excited states in N_{2} (2012)

John E. Furst, T. J. Gay, Joshua Machacek, David Kilkoyne, and Kenneth W. McLaughlin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-03

Description: Author(s): John E. Furst, T. J. Gay, Joshua Machacek, David Kilkoyne, and Kenneth W. McLaughlin We have measured the total fluorescent intensity and circular polarization of light emitted in 3 p 4 P o →3 s 4 P transitions of excited neutral nitrogen atoms created by the photofragmentation of the N 2 molecule with circularly polarized light having energies between 21 and 26 eV. The intensity measure... [Phys. Rev. A 86, 041401] Published Tue Oct 02, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Towards practical classical processing for the surface code: Timing analysis (2012)

Austin G. Fowler, Adam C. Whiteside, and Lloyd C. L. Hollenberg

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-13

Description: Author(s): Austin G. Fowler, Adam C. Whiteside, and Lloyd C. L. Hollenberg Topological quantum error-correction codes have high thresholds and are well suited to physical implementation. The minimum-weight perfect-matching algorithm can be used to efficiently handle errors in such codes. We perform a timing analysis of our current implementation of the minimum-weight perfe... [Phys. Rev. A 86, 042313] Published Fri Oct 12, 2012

Keywords: Quantum information

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Time-dependent analytical R-matrix approach for strong-field dynamics. II. Many-electron systems (2012)

Lisa Torlina, Misha Ivanov, Zachary B. Walters, and Olga Smirnova

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-06

Description: Author(s): Lisa Torlina, Misha Ivanov, Zachary B. Walters, and Olga Smirnova Ionization of atoms and molecules in intense low-frequency fields is a multielectron process which may leave the ion in different excited states. Within the adiabatic perspective on strong-field ionization, usually referred to as optical tunneling, electrons remaining in the molecular ion are assume... [Phys. Rev. A 86, 043409] Published Fri Oct 05, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Time-dependent analytical R-matrix approach for strong-field dynamics. I. One-electron systems (2012)

Lisa Torlina and Olga Smirnova

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-06

Description: Author(s): Lisa Torlina and Olga Smirnova We develop a flexible analytical approach to describe strong-field dynamics in atoms and molecules. The approach is based on the ideas of the R -matrix method. Here, we illustrate and validate our approach by applying it to systems with one active electron bound by the Coulomb potential and benchmark... [Phys. Rev. A 86, 043408] Published Fri Oct 05, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Nondipole effects in attosecond photoelectron streaking (2012)

Maciej Dominik Śpiewanowski and Lars Bojer Madsen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-06

Description: Author(s): Maciej Dominik Śpiewanowski and Lars Bojer Madsen The influence of nondipole terms on the time delay in photoionization by an extreme-ultraviolet attosecond pulse in the presence of a near-infrared femtosecond laser pulse from 1 s , 2 s , and 2 p states in hydrogen is investigated. In this attosecond photoelectron streaking process, the relative importa... [Phys. Rev. A 86, 045401] Published Fri Oct 05, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Photoexcitation of n≃305 Rydberg states in the presence of an rf drive field (2012)

S. Yoshida, C. O. Reinhold, J. Burgdörfer, S. Ye, and F. B. Dunning

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-10

Description: Author(s): S. Yoshida, C. O. Reinhold, J. Burgdörfer, S. Ye, and F. B. Dunning The response of highly excited potassium Rydberg states with n ∼305 to a sinusoidal electric drive field in the radio frequency (100–300 MHz) regime is examined by photoexcitation from the 4 s ground state using a uv probe beam. The drive field couples many Rydberg levels simultaneously and results i... [Phys. Rev. A 86, 043415] Published Tue Oct 09, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Attosecond cascades and time delays in one-electron photoionization (2012)

Suren Sukiasyan, Kenichi L. Ishikawa, and Misha Ivanov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-22

Description: Author(s): Suren Sukiasyan, Kenichi L. Ishikawa, and Misha Ivanov We present time-resolved ab initio study of the attosecond dynamics of electron-electron correlation during single-electron, single XUV-photon ionization of an excited helium atom. We identify multiple time scales in these dynamics, caused by the interplay of the initial shake-up excitation with the... [Phys. Rev. A 86, 033423] Published Fri Sep 21, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Two-dimensional Affleck-Kennedy-Lieb-Tasaki state on the honeycomb lattice is a universal resource for quantum computation (2012)

Tzu-Chieh Wei, Ian Affleck, and Robert Raussendorf

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-22

Description: Author(s): Tzu-Chieh Wei, Ian Affleck, and Robert Raussendorf Universal quantum computation can be achieved by simply performing single-qubit measurements on a highly entangled resource state. Resource states can arise from ground states of carefully designed two-body interacting Hamiltonians. This opens up an appealing possibility of creating them by cooling.... [Phys. Rev. A 86, 032328] Published Fri Sep 21, 2012

Keywords: Quantum information

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Solving the graph-isomorphism problem with a quantum annealer (2012)

Itay Hen and A. P. Young

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-11

Description: Author(s): Itay Hen and A. P. Young We propose a method using a quantum annealer—an analog quantum computer based on the principles of quantum adiabatic evolution—to solve the graph isomorphism problem, in which one has to determine whether two graphs are isomorphic (i.e., can be transformed into each other simply by a relabeling of t... [Phys. Rev. A 86, 042310] Published Wed Oct 10, 2012

Keywords: Quantum information

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Adiabatic theory of ionization by intense laser pulses: Finite-range potentials (2012)

Oleg I. Tolstikhin and Toru Morishita

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-12

Description: Author(s): Oleg I. Tolstikhin and Toru Morishita The adiabatic theory of ionization of an electron, initially bound in a three-dimensional potential well, by an intense low-frequency laser pulse is developed. The general case of arbitrary time dependence and polarization of the laser field and arbitrary potential which can model an atom or a molec... [Phys. Rev. A 86, 043417] Published Thu Oct 11, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Robustness of device-independent dimension witnesses (2012)

Michele Dall’Arno, Elsa Passaro, Rodrigo Gallego, and Antonio Acín

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-12

Description: Author(s): Michele Dall’Arno, Elsa Passaro, Rodrigo Gallego, and Antonio Acín Device-independent dimension witnesses provide a lower bound on the dimensionality of classical and quantum systems in a “black box”scenario where only correlations between preparations, measurements, and outcomes are considered. We address the problem of the robustness of dimension witnesses, namel... [Phys. Rev. A 86, 042312] Published Thu Oct 11, 2012

Keywords: Quantum information

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Energy as a witness of multipartite entanglement in chains of arbitrary spins (2012)

F. Troiani and I. Siloi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-22

Description: Author(s): F. Troiani and I. Siloi We develop a general approach for deriving the energy minima of biseparable states in chains of arbitrary spins s , and we report numerical results for spin values s ≤5/2 (with N ≤8). The minima provide a set of threshold values for exchange energy that allow us to detect different degrees of multipart... [Phys. Rev. A 86, 032330] Published Fri Sep 21, 2012

Keywords: Quantum information

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Thermodynamic formalism for dissipative quantum walks (2012)

Silvano Garnerone

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-29

Description: Author(s): Silvano Garnerone We consider the dynamical properties of dissipative continuous-time quantum walks on directed graphs. Using a large-deviation approach we construct a thermodynamic formalism allowing us to define a dynamical order parameter, and to identify transitions between dynamical regimes. For a particular cla... [Phys. Rev. A 86, 032342] Published Fri Sep 28, 2012

Keywords: Quantum information

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Manipulating one- and two-dimensional stimulated-x-ray resonant-Raman signals in molecules by pulse polarizations (2012)

Daniel Healion, Jason D. Biggs, and Shaul Mukamel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-09-29

Description: Author(s): Daniel Healion, Jason D. Biggs, and Shaul Mukamel The simulation of spontaneous (RIXS) and stimulated x-ray Raman scattering (SXRS) signals in isotropic samples requires rotational averaging of a fourth-rank tensor product of two polarizabilities. Attosecond stimulated x-ray Raman spectroscopy excites multiple valence transitions covered by the pul... [Phys. Rev. A 86, 033429] Published Fri Sep 28, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Growth of graph states in quantum networks (2012)

Martí Cuquet and John Calsamiglia

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-04

Description: Author(s): Martí Cuquet and John Calsamiglia We propose a scheme to distribute graph states over quantum networks in the presence of noise in the channels and in the operations. The protocol can be implemented efficiently for large graph sates of arbitrary (complex) topology. We benchmark our scheme with two protocols where each connected comp... [Phys. Rev. A 86, 042304] Published Wed Oct 03, 2012

Keywords: Quantum information

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Noiseless suppression of losses in optical quantum communication with conventional on-off photon detectors (2012)

Guang; Si Meng, Song Yang, Xu; Bo Zou, Sheng; Li Zhang, Bao; Sen Shi, and Guang; Can Guo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-05

Description: Author(s): GuangSi Meng, Song Yang, XuBo Zou, ShengLi Zhang, BaoSen Shi, and GuangCan Guo The losses in a bosonic channel are the primary source of errors in current optic quantum communications. Astonishingly, by combining the noiseless attenuation and noiseless linear amplification, Mičuda et al. showed that the unavoidable losses in optic links can be compensated in a nondeterministic... [Phys. Rev. A 86, 042305] Published Thu Oct 04, 2012

Keywords: Quantum information

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Dissociation dynamics of diatomic molecules in intense laser fields: A scheme for the selection of relevant adiabatic potential curves (2012)

M. Magrakvelidze, C. M. Aikens, and U. Thumm

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-08-02

Description: Author(s): M. Magrakvelidze, C. M. Aikens, and U. Thumm We investigated the nuclear dynamics of diatomic molecular ions in intense laser fields by analyzing their fragment kinetic-energy release (KER) spectra as a function of the pump-probe delay τ . Within the Born-Oppenheimer (BO) approximation, we calculated ab initio adiabatic potential-energy curves ... [Phys. Rev. A 86, 023402] Published Wed Aug 01, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Angular and dynamical properties in resonant inelastic x-ray scattering: Case study of chlorine-containing molecules (2012)

Renaud Guillemin, Wayne C. Stolte, Loïc Journel, Stéphane Carniato, Maria Novella Piancastelli, Dennis W. Lindle, and Marc Simon

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-12

Description: Author(s): Renaud Guillemin, Wayne C. Stolte, Loïc Journel, Stéphane Carniato, Maria Novella Piancastelli, Dennis W. Lindle, and Marc Simon Polarization-dependent resonant inelastic x-ray scattering (RIXS) has been shown to be a probe of molecular-field effects on the electronic structure of isolated molecules. In this experimental analysis we explain the linear dichroism observed in Cl 2 p polarized RIXS following Cl 1 s excitation of a ... [Phys. Rev. A 86, 013407] Published Wed Jul 11, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Entropic enhancement of spatial correlations in a laser-driven Rydberg gas (2012)

C. Ates and I. Lesanovsky

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-12

Description: Author(s): C. Ates and I. Lesanovsky Laser-driven Rydberg gases are many-body quantum systems that exhibit a pronounced collective excitation behavior due to the strong interaction between atoms in high-lying electronic states. Atoms located within a so-called blockade volume share a single Rydberg excitation, which is dynamically crea... [Phys. Rev. A 86, 013408] Published Wed Jul 11, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Dynamics of geometric and entropic quantifiers of correlations in open quantum systems (2012)

B. Bellomo, R. Lo Franco, and G. Compagno

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): B. Bellomo, R. Lo Franco, and G. Compagno We extend the Hilbert-Schmidt (square norm) distance, previously used to define the geometric quantum discord, to define also geometric quantifiers of total and classical correlations. We then compare the dynamics of geometric and entropic quantifiers of the different kinds of correlations in a non-... [Phys. Rev. A 86, 012312] Published Fri Jul 13, 2012

Keywords: Quantum information

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86

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Preparation and entanglement purification through two-step measurements (2012)

Nan Qiu, Shu-chao Wang, Leong Chuan Kwek, and Xiang-Bin Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Nan Qiu, Shu-chao Wang, Leong Chuan Kwek, and Xiang-Bin Wang A method of purification through Zeno-like measurements has been proposed by Nakazato and co-workers [ H. Nakazato, T. Takazawa and K. Yuasa Phys. Rev. Lett. 90 060401 (2003) ; H. Nakazato, M. Unoki and K. Yuasa Phys. Rev. A 70 012303 (2004) ]. A series of frequent measurements on a quantum system ... [Phys. Rev. A 86, 012313] Published Fri Jul 13, 2012

Keywords: Quantum information

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Qubits as spectrometers of dephasing noise (2012)

Kevin C. Young and K. Birgitta Whaley

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Kevin C. Young and K. Birgitta Whaley We present a procedure for direct characterization of the dephasing noise acting on a single qubit by making repeated measurements of the qubit coherence under suitably chosen sequences of controls. We show that this allows a numerical reconstruction of the short-time noise correlation function and ... [Phys. Rev. A 86, 012314] Published Fri Jul 13, 2012

Keywords: Quantum information

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88

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Quantum reading under a local energy constraint (2012)

Gaetana Spedalieri, Cosmo Lupo, Stefano Mancini, Samuel L. Braunstein, and Stefano Pirandola

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Gaetana Spedalieri, Cosmo Lupo, Stefano Mancini, Samuel L. Braunstein, and Stefano Pirandola Nonclassical states of light play a central role in many quantum information protocols. Very recently, their quantum features have been exploited to improve the readout of information from digital memories, modeled as arrays of microscopic beam splitters [ Pirandola Phys. Rev. Lett. 106 090504 (201... [Phys. Rev. A 86, 012315] Published Fri Jul 13, 2012

Keywords: Quantum information

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89

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Sensitive imaging of electromagnetic fields with paramagnetic polar molecules (2012)

Sergey V. Alyabyshev, Mikhail Lemeshko, and Roman V. Krems

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Sergey V. Alyabyshev, Mikhail Lemeshko, and Roman V. Krems We propose a method for sensitive parallel detection of low-frequency electromagnetic fields based on the fine structure interactions in paramagnetic polar molecules. Compared to the recently implemented scheme employing ultracold 87 Rb atoms by Böhi et al. [ Appl. Phys. Lett. 97 051101 (2010) ], the... [Phys. Rev. A 86, 013409] Published Fri Jul 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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90

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Application of a numerical-basis-state method to strong-field excitation and ionization of hydrogen atoms (2012)

Shaohao Chen, Xiang Gao, Jiaming Li, Andreas Becker, and Agnieszka Jaroń-Becker

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Shaohao Chen, Xiang Gao, Jiaming Li, Andreas Becker, and Agnieszka Jaroń-Becker We apply a numerical-basis-state method to study dynamical processes in the interaction of atoms with strong laser pulses. The method is based on the numerical representation of finite-space energy eigenstates of the field-free atomic Hamiltonian in a box on a grid and the expansion of the solution ... [Phys. Rev. A 86, 013410] Published Fri Jul 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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91

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Effects of macroscopic propagation on spectra of broadband supercontinuum harmonics and isolated-attosecond-pulse generation: Coherent control of the electron quantum trajectories in two-color laser fields (2012)

Peng-Cheng Li and Shih-I Chu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-14

Description: Author(s): Peng-Cheng Li and Shih-I Chu Recently it was shown that broadband supercontinuum harmonics can be produced from the long-trajectory electrons in the single-atom response by the coherent control of the electron trajectories through optimized two-color laser fields. Such supercontinuum harmonics can be superposed to generate an i... [Phys. Rev. A 86, 013411] Published Fri Jul 13, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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92

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Spin squeezing under non-Markovian channels by the hierarchy equation method (2012)

Xiaolei Yin, Jian Ma, Xiaoguang Wang, and Franco Nori

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-12

Description: Author(s): Xiaolei Yin, Jian Ma, Xiaoguang Wang, and Franco Nori We study the decoherence of spin squeezing under non-Markovian channels and consider an ensemble of N independent spin- 1/2 particles with exchange symmetry. Each spin interacts with its own bath, and the baths are independent and identical. For this kind of open system, the spin squeezing under deco... [Phys. Rev. A 86, 012308] Published Wed Jul 11, 2012

Keywords: Quantum information

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93

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Evolution of quantum discord and its stability in two-qubit NMR systems (2012)

Hemant Katiyar, Soumya Singha Roy, T. S. Mahesh, and Apoorva Patel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-07-12

Description: Author(s): Hemant Katiyar, Soumya Singha Roy, T. S. Mahesh, and Apoorva Patel We investigate evolution of quantum correlations in ensembles of two-qubit nuclear spin systems via nuclear magnetic resonance techniques. We use discord as a measure of quantum correlations and the Werner state as an explicit example. We, first, introduce different ways of measuring discord and geo... [Phys. Rev. A 86, 012309] Published Wed Jul 11, 2012

Keywords: Quantum information

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Above-threshold ionization by few-cycle spatially inhomogeneous fields (2012)

M. F. Ciappina, J. A. Pérez-Hernández, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-08-21

Description: Author(s): M. F. Ciappina, J. A. Pérez-Hernández, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein We present theoretical studies of above-threshold ionization (ATI) produced by spatially inhomogeneous fields. This kind of field appears as a result of the illumination of plasmonic nanostructures and metal nanoparticles with a short laser pulse. We use the time-dependent Schrödinger equation in re... [Phys. Rev. A 86, 023413] Published Mon Aug 20, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Thermal entanglement witness for interacting itinerant fermion systems (2012)

A. N. Ribeiro and C. A. Macedo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-08-21

Description: Author(s): A. N. Ribeiro and C. A. Macedo The Hubbard model describes interacting itinerant fermion systems and is the simplest model capable of describing the essential physics of strongly correlated electron systems. In this model, both spin correlations and charge correlations are important for the entanglement, thus the magnetic suscept... [Phys. Rev. A 86, 022320] Published Mon Aug 20, 2012

Keywords: Quantum information

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96

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Generating non-Gaussian states using collisions between Rydberg polaritons (2012)

Jovica Stanojevic, Valentina Parigi, Erwan Bimbard, Alexei Ourjoumtsev, Pierre Pillet, and Philippe Grangier

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-08-23

Description: Author(s): Jovica Stanojevic, Valentina Parigi, Erwan Bimbard, Alexei Ourjoumtsev, Pierre Pillet, and Philippe Grangier We investigate theoretically the deterministic generation of quantum states with negative Wigner functions, by using giant nonlinearities due to collisional interactions between Rydberg polaritons. The state resulting from the polariton interactions may be transferred with high fidelity into a photo... [Phys. Rev. A 86, 021403] Published Wed Aug 22, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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97

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Traveling-wave deceleration of heavy polar molecules in low-field-seeking states (2012)

N. E. Bulleid, R. J. Hendricks, E. A. Hinds, Samuel A. Meek, Gerard Meijer, Andreas Osterwalder, and M. R. Tarbutt

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-08-23

Description: Author(s): N. E. Bulleid, R. J. Hendricks, E. A. Hinds, Samuel A. Meek, Gerard Meijer, Andreas Osterwalder, and M. R. Tarbutt We demonstrate the deceleration of heavy polar molecules in low-field-seeking states by combining a cryogenic source and a traveling-wave Stark decelerator. The cryogenic source provides a high-intensity beam with low speed and temperature, and the traveling-wave decelerator provides large decelerat... [Phys. Rev. A 86, 021404] Published Wed Aug 22, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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98

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Source monitoring for continuous-variable quantum key distribution (2012)

Jian Yang, Bingjie Xu, and Hong Guo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-16

Description: Author(s): Jian Yang, Bingjie Xu, and Hong Guo The noise in optical source preparation needs to be characterized for the security of practical continuous-variable quantum key distribution (CVQKD). Two feasible schemes, based on either an active optical switch or a passive beamsplitter, are proposed to monitor the variance of the source noise. We... [Phys. Rev. A 86, 042314] Published Mon Oct 15, 2012

Keywords: Quantum information

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Security proof of the unbalanced phase-encoded Bennett-Brassard 1984 protocol (2012)

Agnes Ferenczi, Varun Narasimhachar, and Norbert Lütkenhaus

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-20

Description: Author(s): Agnes Ferenczi, Varun Narasimhachar, and Norbert Lütkenhaus In optical implementations of the phase-encoded BB84 protocol, the bit information is usually encoded in the phase of two consecutive photon pulses generated in a Mach-Zehnder interferometer. In the actual experimental realization, the loss in the arms of the Mach-Zehnder interferometer is not balan... [Phys. Rev. A 86, 042327] Published Fri Oct 19, 2012

Keywords: Quantum information

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100

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Simulation of laser-induced quantum dynamics of the electronic and nuclear motion in the ozone molecule on the attosecond time scale (2012)

G. J. Halász, A. Perveaux, B. Lasorne, M. A. Robb, F. Gatti, and Á. Vibók

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-10-23

Description: Author(s): G. J. Halász, A. Perveaux, B. Lasorne, M. A. Robb, F. Gatti, and Á. Vibók The nonadiabatically coupled dynamics of electrons and nuclei is investigated for the ozone molecule on the attosecond time scale. A coherent superposition of nuclear wave packets located on different electronic states in the Chappuis and in the Hartley bands are created by pump pulses. The multicon... [Phys. Rev. A 86, 043426] Published Mon Oct 22, 2012

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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