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Localization of Interacting Dirac Fermions (2018)

Tianxing Ma, Lufeng Zhang, Chia-Chen Chang, Hsiang-Hsuan Hung, and Richard T. Scalettar

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-03-13

Beschreibung: Author(s): Tianxing Ma, Lufeng Zhang, Chia-Chen Chang, Hsiang-Hsuan Hung, and Richard T. Scalettar Using exact quantum Monte Carlo calculations, we examine the interplay between localization of electronic states driven by many-body correlations and that by randomness in a two-dimensional system featuring linearly vanishing density of states at the Fermi level. A novel disorder-induced nonmagnetic... [Phys. Rev. Lett. 120, 116601] Published Mon Mar 12, 2018

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Entanglement spectrum of mixed states (2018)

Evert van Nieuwenburg and Oded Zilberberg

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Evert van Nieuwenburg and Oded Zilberberg Entanglement plays an important role in our ability to understand, simulate, and harness quantum many-body phenomena. In this work, we investigate the entanglement spectrum for open one-dimensional (1D) systems and propose a natural quantifier for how much a 1D quantum state is entangled while being... [Phys. Rev. A 98, 012327] Published Wed Jul 25, 2018

Schlagwort(e): Quantum information

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Photon-Number-Resolved Measurement of an Exciton-Polariton Condensate (2018)

M. Klaas, E. Schlottmann, H. Flayac, F. P. Laussy, F. Gericke, M. Schmidt, M. v. Helversen, J. Beyer, S. Brodbeck, H. Suchomel, S. Höfling, S. Reitzenstein, and C. Schneider

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): M. Klaas, E. Schlottmann, H. Flayac, F. P. Laussy, F. Gericke, M. Schmidt, M. v. Helversen, J. Beyer, S. Brodbeck, H. Suchomel, S. Höfling, S. Reitzenstein, and C. Schneider By counting the photons emitted from a microcavity, researchers shed light on the nature of an exotic condensate of quasiparticles contained in the cavity. [Phys. Rev. Lett. 121, 047401] Published Wed Jul 25, 2018

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Unifying framework for spatial and temporal quantum correlations (2018)

Fabio Costa, Martin Ringbauer, Michael E. Goggin, Andrew G. White, and Alessandro Fedrizzi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-07-27

Beschreibung: Author(s): Fabio Costa, Martin Ringbauer, Michael E. Goggin, Andrew G. White, and Alessandro Fedrizzi Measurements on a single quantum system at different times reveal rich nonclassical correlations similar to those observed in spatially separated multipartite systems. Here we introduce a theory framework that unifies the description of temporal, spatial, and spatiotemporal resources for quantum cor... [Phys. Rev. A 98, 012328] Published Thu Jul 26, 2018

Schlagwort(e): Quantum information

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Detecting Superconductivity in the High Pressure Hydrides and Metallic Hydrogen from Optical Properties (2018)

J. P. Carbotte, E. J. Nicol, and T. Timusk

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-27

Beschreibung: Author(s): J. P. Carbotte, E. J. Nicol, and T. Timusk We present a new technique for measuring the critical temperature T c in the high pressure, high T c electron-phonon-driven superconducting hydrides. This technique does not require connecting leads to the sample. In the region of the absorption spectrum above the sum of the optical gap and maximum ph... [Phys. Rev. Lett. 121, 047002] Published Thu Jul 26, 2018

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Interplay between speed and fidelity in off-resonant quantum-state-transfer protocols (2018)

Guilherme M. A. Almeida

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-07-31

Beschreibung: Author(s): Guilherme M. A. Almeida An arbitrary qubit can be transmitted through a spin chain by perturbatively coupling both communicating parties to it. These so-called weak-coupling models rely on effective Rabi oscillations between the outer spins, yielding nearly maximum fidelity while offering great resilience against disorder ... [Phys. Rev. A 98, 012334] Published Mon Jul 30, 2018

Schlagwort(e): Quantum information

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Quantum compiling with diffusive sets of gates (2018)

Y. Zhiyenbayev, V. M. Akulin, and A. Mandilara

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Y. Zhiyenbayev, V. M. Akulin, and A. Mandilara Given a set of quantum gates and a target unitary operation, the most elementary task of quantum compiling is the identification of a sequence of the gates that approximates the target unitary to a determined precision ɛ . The Solovay-Kitaev theorem provides an elegant solution which is based on the ... [Phys. Rev. A 98, 012325] Published Tue Jul 24, 2018

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Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to $1T\text{−}{\mathrm{Ta}\mathrm{S}}_{2}$ (2018)

Wen-Yu He, Xiao Yan Xu, Gang Chen, K. T. Law, and Patrick A. Lee

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Wen-Yu He, Xiao Yan Xu, Gang Chen, K. T. Law, and Patrick A. Lee 1 T − Ta S 2 is a cluster Mott insulator on the triangular lattice with 13 Ta atoms forming a star of David cluster as the unit cell. We derive a two-dimensional X X Z spin- 1 / 2 model with a four-spin ring exchange term to describe the effective low energy physics of a monolayer 1 T − Ta S 2 , where the effective... [Phys. Rev. Lett. 121, 046401] Published Tue Jul 24, 2018

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Development of Ferromagnetic Fluctuations in Heavily Overdoped $(\mathrm{Bi},\mathrm{Pb}{)}_{2}{\mathrm{Sr}}_{2}{\mathrm{CuO}}_{6+δ}$ Copper Oxides (2018)

Koshi Kurashima, Tadashi Adachi, Kensuke M. Suzuki, Yasushi Fukunaga, Takayuki Kawamata, Takashi Noji, Hitoshi Miyasaka, Isao Watanabe, Masanori Miyazaki, Akihiro Koda, Ryosuke Kadono, and Yoji Koike

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-02

Beschreibung: Author(s): Koshi Kurashima, Tadashi Adachi, Kensuke M. Suzuki, Yasushi Fukunaga, Takayuki Kawamata, Takashi Noji, Hitoshi Miyasaka, Isao Watanabe, Masanori Miyazaki, Akihiro Koda, Ryosuke Kadono, and Yoji Koike We demonstrate the presence of ferromagnetic (FM) fluctuations in the superconducting and nonsuperconducting heavily overdoped regimes of high-temperature superconducting copper oxides, using ( Bi , Pb ) 2 Sr 2 CuO 6 + δ (Bi-2201) single crystals. Magnetization curves exhibit a tendency to be saturated in high... [Phys. Rev. Lett. 121, 057002] Published Wed Aug 01, 2018

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Defect-Assisted Tunneling Electroresistance in Ferroelectric Tunnel Junctions (2018)

Konstantin Klyukin, L. L. Tao, Evgeny Y. Tsymbal, and Vitaly Alexandrov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): Konstantin Klyukin, L. L. Tao, Evgeny Y. Tsymbal, and Vitaly Alexandrov Recent experimental results have demonstrated ferroelectricity in thin films of SrTiO 3 induced by antisite Ti Sr defects. This opens a possibility to use SrTiO 3 as a barrier layer in ferroelectric tunnel junctions (FTJs)—emerging electronic devices promising for applications in nanoelectronics. Here ... [Phys. Rev. Lett. 121, 056601] Published Fri Aug 03, 2018

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Several nonlocal sets of multipartite pure orthogonal product states (2018)

Saronath Halder

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): Saronath Halder It is known that there exist sets of pure orthogonal product states which cannot be perfectly distinguished by local operations and classical communication (LOCC). Such sets are nonlocal sets which exhibit nonlocality without entanglement. These nonlocal sets can be completable or uncompletable. In ... [Phys. Rev. A 98, 022303] Published Fri Aug 03, 2018

Schlagwort(e): Quantum information

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Robust readout of bosonic qubits in the dispersive coupling regime (2018)

Connor T. Hann, Salvatore S. Elder, Christopher S. Wang, Kevin Chou, Robert J. Schoelkopf, and Liang Jiang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Connor T. Hann, Salvatore S. Elder, Christopher S. Wang, Kevin Chou, Robert J. Schoelkopf, and Liang Jiang High-fidelity qubit measurements play a crucial role in quantum computation, communication, and metrology. In recent experiments, it has been shown that readout fidelity can be improved by performing repeated quantum nondemolition (QND) readouts of a qubit's state through an ancilla. For a qubit enc... [Phys. Rev. A 98, 022305] Published Mon Aug 06, 2018

Schlagwort(e): Quantum information

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Interrelation between partial coherence and quantum correlations (2018)

Sunho Kim, Longsuo Li, Asutosh Kumar, and Junde Wu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Sunho Kim, Longsuo Li, Asutosh Kumar, and Junde Wu Both coherence and entanglement stem from the superposition principle, capture quantumness of a physical system, and play a central role in quantum physics. In a multipartite quantum system, coherence and quantum correlations are closely connected. In particular, it has been established that quantum... [Phys. Rev. A 98, 022306] Published Mon Aug 06, 2018

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Counterpropagating Fractional Hall States in Mirror-Symmetric Dirac Semimetals (2018)

Yafis Barlas

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Yafis Barlas The Landau bands of mirror symmetric 2D Dirac semimetals (e.g., odd layers of A B A graphene) can be identified by their parity with respect to mirror symmetry. This symmetry facilitates a new class of counterpropagating Hall states. We predict the presence of a Laughlin-like correlated liquid state, ... [Phys. Rev. Lett. 121, 066602] Published Tue Aug 07, 2018

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Generation of Quantized Polaritons below the Condensation Threshold (2018)

Peter Cristofolini, Z. Hatzopoulos, Pavlos G. Savvidis, and Jeremy J. Baumberg

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Peter Cristofolini, Z. Hatzopoulos, Pavlos G. Savvidis, and Jeremy J. Baumberg Exciton polaritons in high quality semiconductor microcavities can travel long macroscopic distances ( 〉 100 μ m ) due to their ultralight effective mass. The polaritons are repelled from optically pumped exciton reservoirs where they are formed; however, their spatial dynamics is not as expected fo... [Phys. Rev. Lett. 121, 067401] Published Tue Aug 07, 2018

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Entanglement enhancement in multimode integrated circuits (2018)

Zacharie M. Léger, Aharon Brodutch, and Amr S. Helmy

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-05

Beschreibung: Author(s): Zacharie M. Léger, Aharon Brodutch, and Amr S. Helmy The faithful distribution of entanglement in continuous-variable systems is essential to many quantum information protocols. As such, entanglement distillation and enhancement schemes are a cornerstone of many applications. The photon subtraction scheme offers enhancement with a relatively simple se... [Phys. Rev. A 97, 062303] Published Mon Jun 04, 2018

Schlagwort(e): Quantum information

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Magnon Splitting Induced by Charge Transfer in the Three-Orbital Hubbard Model (2018)

Yao Wang, Edwin W. Huang, Brian Moritz, and Thomas P. Devereaux

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Yao Wang, Edwin W. Huang, Brian Moritz, and Thomas P. Devereaux Understanding spin excitations and their connection to unconventional superconductivity have remained central issues since the discovery of cuprates. Direct measurement of the dynamical spin structure factor in the parent compounds can provide key information on important interactions relevant in th... [Phys. Rev. Lett. 120, 246401] Published Mon Jun 11, 2018

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Tensor network states in time-bin quantum optics (2018)

Michael Lubasch, Antonio A. Valido, Jelmer J. Renema, W. Steven Kolthammer, Dieter Jaksch, M. S. Kim, Ian Walmsley, and Raúl García-Patrón

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Michael Lubasch, Antonio A. Valido, Jelmer J. Renema, W. Steven Kolthammer, Dieter Jaksch, M. S. Kim, Ian Walmsley, and Raúl García-Patrón The current shift in the quantum optics community towards experiments with many modes and photons necessitates new classical simulation techniques that efficiently encode many-body quantum correlations and go beyond the usual phase-space formulation. To address this pressing demand we formulate line... [Phys. Rev. A 97, 062304] Published Tue Jun 05, 2018

Schlagwort(e): Quantum information

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Strong and uniform convergence in the teleportation simulation of bosonic Gaussian channels (2018)

Mark M. Wilde

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Mark M. Wilde In the literature on the continuous-variable bosonic teleportation protocol due to Braunstein and Kimble [ Phys. Rev. Lett. 80 , 869 (1998) ], it is often loosely stated that this protocol converges to a perfect teleportation of an input state in the limit of ideal squeezing and ideal detection, but th... [Phys. Rev. A 97, 062305] Published Tue Jun 05, 2018

Schlagwort(e): Quantum information

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Clocks in Feynman's computer and Kitaev's local Hamiltonian: Bias, gaps, idling, and pulse tuning (2018)

Libor Caha, Zeph Landau, and Daniel Nagaj

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Libor Caha, Zeph Landau, and Daniel Nagaj We present a collection of results about the clock in Feynman's computer construction and Kitaev's local Hamiltonian problem. First, by analyzing the spectra of quantum walks on a line with varying end-point terms, we find a better lower bound on the gap of the Feynman Hamiltonian, which translates ... [Phys. Rev. A 97, 062306] Published Tue Jun 05, 2018

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Device independence for two-party cryptography and position verification with memoryless devices (2018)

Jérémy Ribeiro, Le Phuc Thinh, Jędrzej Kaniewski, Jonas Helsen, and Stephanie Wehner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Jérémy Ribeiro, Le Phuc Thinh, Jędrzej Kaniewski, Jonas Helsen, and Stephanie Wehner Quantum communication has demonstrated its usefulness for quantum cryptography far beyond quantum key distribution. One domain is two-party cryptography, whose goal is to allow two parties who may not trust each other to solve joint tasks. Another interesting application is position-based cryptograp... [Phys. Rev. A 97, 062307] Published Tue Jun 05, 2018

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Electron Phonon Coupling versus Photoelectron Energy Loss at the Origin of Replica Bands in Photoemission of FeSe on ${\mathrm{SrTiO}}_{3}$ (2018)

Fengmiao Li and George A. Sawatzky

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Fengmiao Li and George A. Sawatzky The recent observation of replica bands in single-layer FeSe / SrTiO 3 by angle-resolved photoemission spectroscopy (ARPES) has triggered intense discussions concerning the potential influence of the FeSe electrons coupling with substrate phonons on the superconducting transition temperature. Here we p... [Phys. Rev. Lett. 120, 237001] Published Tue Jun 05, 2018

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Asymptotic quantum algorithm for the Toeplitz systems (2018)

Lin-Chun Wan, Chao-Hua Yu, Shi-Jie Pan, Fei Gao, Qiao-Yan Wen, and Su-Juan Qin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-16

Beschreibung: Author(s): Lin-Chun Wan, Chao-Hua Yu, Shi-Jie Pan, Fei Gao, Qiao-Yan Wen, and Su-Juan Qin Solving the Toeplitz systems, which involves finding the vector x such that T n x = b given an n × n Toeplitz matrix T n and a vector b , has a variety of applications in mathematics and engineering. In this paper, we present a quantum algorithm for solving the linear equations of Toeplitz matrices, in whic... [Phys. Rev. A 97, 062322] Published Fri Jun 15, 2018

Schlagwort(e): Quantum information

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Scale-invariant freezing of entanglement (2018)

Titas Chanda, Tamoghna Das, Debasis Sadhukhan, Amit Kumar Pal, Aditi Sen(De), and Ujjwal Sen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-16

Beschreibung: Author(s): Titas Chanda, Tamoghna Das, Debasis Sadhukhan, Amit Kumar Pal, Aditi Sen(De), and Ujjwal Sen We show that bipartite entanglement in an one-dimensional quantum spin model undergoing time evolution due to local Markovian environments can be frozen over time. We demonstrate this by using a number of paradigmatic quantum spin models including the anisotropic X Y model in the presence of a unifor... [Phys. Rev. A 97, 062324] Published Fri Jun 15, 2018

Schlagwort(e): Quantum information

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${Z}_{N}$ Berry Phases in Symmetry Protected Topological Phases (2018)

Toshikaze Kariyado, Takahiro Morimoto, and Yasuhiro Hatsugai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-16

Beschreibung: Author(s): Toshikaze Kariyado, Takahiro Morimoto, and Yasuhiro Hatsugai We show that the Z N Berry phase (Berry phase quantized into 2 π / N ) provides a useful tool to characterize symmetry protected topological phases with correlation that can be directly computed through numerics of a relatively small system size. The Z N Berry phase is defined in a N − 1 -dimensional paramet... [Phys. Rev. Lett. 120, 247202] Published Fri Jun 15, 2018

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Quasiprobability representation of quantum coherence (2018)

J. Sperling and I. A. Walmsley

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-20

Beschreibung: Author(s): J. Sperling and I. A. Walmsley We introduce a general method for the construction of quasiprobability representations for arbitrary notions of quantum coherence. Our technique yields a non-negative probability distribution for the decomposition of any classical state. Conversely, quantum phenomena are certified in terms of signed... [Phys. Rev. A 97, 062327] Published Tue Jun 19, 2018

Schlagwort(e): Quantum information

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Optimization-free measures of quantum resources (2018)

Nikolaos K. Kollas

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-06-28

Beschreibung: Author(s): Nikolaos K. Kollas A closed expression is derived for the amount of resource present in a quantum state as quantified by a distance measure based on the Tsallis relative entropy introduced recently [H. Zhao and C.-s. Yu, Sci. Rep. 8 , 299 (2018) ], for any resource theory whose set of free states is described by the ima... [Phys. Rev. A 97, 062344] Published Wed Jun 27, 2018

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Topology of Disconnected Elementary Band Representations (2018)

Jennifer Cano, Barry Bradlyn, Zhijun Wang, L. Elcoro, M. G. Vergniory, C. Felser, M. I. Aroyo, and B. Andrei Bernevig

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-28

Beschreibung: Author(s): Jennifer Cano, Barry Bradlyn, Zhijun Wang, L. Elcoro, M. G. Vergniory, C. Felser, M. I. Aroyo, and B. Andrei Bernevig A new topological invariant—a movable but unremovable Dirac cone—is identified by considering symmorphic and non-symmorphic space groups of gapped elementary band representations. [Phys. Rev. Lett. 120, 266401] Published Wed Jun 27, 2018

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Quantum Hall Effect with Composites of Magnetic Flux Tubes and Charged Particles (2018)

Marija Todorić, Dario Jukić, Danko Radić, Marin Soljačić, and Hrvoje Buljan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-29

Beschreibung: Author(s): Marija Todorić, Dario Jukić, Danko Radić, Marin Soljačić, and Hrvoje Buljan Composites formed from charged particles and magnetic flux tubes, proposed by Wilczek, are one model for anyons—particles obeying fractional statistics. Here we propose a scheme for realizing charged flux tubes, in which a charged object with an intrinsic magnetic dipole moment is placed between two... [Phys. Rev. Lett. 120, 267201] Published Thu Jun 28, 2018

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Measuring the Rényi entropy of a two-site Fermi-Hubbard model on a trapped ion quantum computer (2018)

N. M. Linke, S. Johri, C. Figgatt, K. A. Landsman, A. Y. Matsuura, and C. Monroe

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-27

Beschreibung: Author(s): N. M. Linke, S. Johri, C. Figgatt, K. A. Landsman, A. Y. Matsuura, and C. Monroe The efficient simulation of correlated quantum systems is a promising near-term application of quantum computers. Here, we present a measurement of the second Rényi entropy of the ground state of the two-site Fermi-Hubbard model on a five-qubit programmable quantum computer based on trapped ions. Ou... [Phys. Rev. A 98, 052334] Published Mon Nov 26, 2018

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Dynamical quantum correlations after sudden quenches (2018)

Utkarsh Mishra, Hadi Cheraghi, Saeed Mahdavifar, R. Jafari, and Alireza Akbari

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-27

Beschreibung: Author(s): Utkarsh Mishra, Hadi Cheraghi, Saeed Mahdavifar, R. Jafari, and Alireza Akbari We employ the mean-field approach in the fermionic picture of the spin- 1 2 X X Z chain to investigate the dynamics of bipartite quantum discord and concurrence under sudden quenching. In this case, when quenching is performed in the anisotropy from an initial value to the critical point, the quantum co... [Phys. Rev. A 98, 052338] Published Mon Nov 26, 2018

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Photon echoes from an atomic frequency comb affected by population relaxation (2018)

Devin Vega and Mingzhen Tian

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-27

Beschreibung: Author(s): Devin Vega and Mingzhen Tian The atomic frequency comb (AFC) is a promising approach for quantum memory, yet creating an ideal AFC only in the ground-state population remains a challenge. We studied an imperfect AFC initially created in the population inversion between the excited and ground states and redistributed due to popu... [Phys. Rev. A 98, 052340] Published Mon Nov 26, 2018

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Probing the Combined Electromagnetic Local Density of Optical States with Quantum Emitters Supporting Strong Electric and Magnetic Transitions (2018)

Dongfang Li, Sinan Karaveli, Sébastien Cueff, Wenhao Li, and Rashid Zia

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-29

Beschreibung: Author(s): Dongfang Li, Sinan Karaveli, Sébastien Cueff, Wenhao Li, and Rashid Zia We experimentally demonstrate that the radiative decay rate of a quantum emitter is determined by the combined electric and magnetic local density of optical states (LDOS). A Drexhage-style experiment was performed for two distinct quantum emitters, divalent nickel ions in magnesium oxide and trival... [Phys. Rev. Lett. 121, 227403] Published Wed Nov 28, 2018

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Blind quantum computation with a noise channel (2018)

Yu-Bo Sheng and Lan Zhou

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Yu-Bo Sheng and Lan Zhou Blind quantum computation (BQC) is a type of quantum computation model. For a client (Alice) who does not have enough sophisticated technology and knowledge to perform universal quantum computation, BQC allows her to resort to a remote quantum computation server (Bob) to delegate universal quantum c... [Phys. Rev. A 98, 052343] Published Tue Nov 27, 2018

Schlagwort(e): Quantum information

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Geometric local-hidden-state model for some two-qubit states (2018)

Bai-Chu Yu, Zhih-Ahn Jia, Yu-Chun Wu, and Guang-Can Guo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Bai-Chu Yu, Zhih-Ahn Jia, Yu-Chun Wu, and Guang-Can Guo Adopting the geometric description of steering assemblages and the local-hidden-state (LHS) model, we construct the optimal LHS model for some two-qubit states under continuous projective measurements and obtain a sufficient steering criterion for all two-qubit states. Using the criterion, we show m... [Phys. Rev. A 98, 052345] Published Tue Nov 27, 2018

Schlagwort(e): Quantum information

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Preparing multiparticle entangled states of nitrogen-vacancy centers via adiabatic ground-state transitions (2018)

Yuan Zhou, Bo Li, Xiao-Xiao Li, Fu-Li Li, and Peng-Bo Li

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Yuan Zhou, Bo Li, Xiao-Xiao Li, Fu-Li Li, and Peng-Bo Li We propose an efficient method to generate multiparticle entangled states of nitrogen-vacancy (NV) centers in a spin-mechanical system, where the spins interact through a collective coupling of the Lipkin-Meshkov-Glick (LMG) type. We show that through adiabatic transitions in the ground state of the... [Phys. Rev. A 98, 052346] Published Tue Nov 27, 2018

Schlagwort(e): Quantum information

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Quantum spatial search on graphs subject to dynamical noise (2018)

Marco Cattaneo, Matteo A. C. Rossi, Matteo G. A. Paris, and Sabrina Maniscalco

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Marco Cattaneo, Matteo A. C. Rossi, Matteo G. A. Paris, and Sabrina Maniscalco We address quantum spatial search on graphs and its implementation by continuous-time quantum walks in the presence of dynamical noise. In particular, we focus on search on the complete graph and on the star graph of order N , also proving that noiseless spatial search shows optimal quantum speedup i... [Phys. Rev. A 98, 052347] Published Tue Nov 27, 2018

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Single-photon heralded two-qubit unitary gates for pairs of nitrogen-vacancy centers in diamond (2018)

Chenxu Liu, M. V. Gurudev Dutt, and David Pekker

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Chenxu Liu, M. V. Gurudev Dutt, and David Pekker The implementation of a high-fidelity two-qubit quantum logic gate remains an outstanding challenge for isolated solid-state qubits such as nitrogen-vacancy (NV) centers in diamond. In this work, we show that by driving pairs of NV centers to undergo photon scattering processes that flip their qubit... [Phys. Rev. A 98, 052342] Published Tue Nov 27, 2018

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Alternative method for deriving nonlocal multipartite product states (2018)

Mao-Sheng Li and Yan-Ling Wang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-11-30

Beschreibung: Author(s): Mao-Sheng Li and Yan-Ling Wang We can only perform finite rounds of measurements in protocols with local operations and classical communication (LOCC). In this paper, we propose a set of product states that require infinite rounds of measurements in order to distinguish this given set of states perfectly by LOCC. Therefore, we ca... [Phys. Rev. A 98, 052352] Published Thu Nov 29, 2018

Schlagwort(e): Quantum information

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Plasmon-Assisted Resonant Electron Tunneling in a Scanning Tunneling Microscope Junction (2018)

Shuyi Liu, Martin Wolf, and Takashi Kumagai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-01

Beschreibung: Author(s): Shuyi Liu, Martin Wolf, and Takashi Kumagai We report plasmon-assisted resonant electron tunneling from a Ag or Au tip to field emission resonances (FERs) of a Ag(111) surface induced by cw laser excitation of a scanning tunneling microscope (STM) junction at visible wavelengths. As a hallmark of the plasmon-assisted resonant tunneling, we ob... [Phys. Rev. Lett. 121, 226802] Published Fri Nov 30, 2018

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Pseudo-Goldstone Gaps and Order-by-Quantum Disorder in Frustrated Magnets (2018)

Jeffrey G. Rau, Paul A. McClarty, and Roderich Moessner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): Jeffrey G. Rau, Paul A. McClarty, and Roderich Moessner In systems with competing interactions, continuous degeneracies can appear which are accidental, in that they are not related to any symmetry of the Hamiltonian. Accordingly, the pseudo-Goldstone modes associated with these degeneracies are also unprotected. Indeed, through a process known as “order... [Phys. Rev. Lett. 121, 237201] Published Mon Dec 03, 2018

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Device-independent witness of arbitrary-dimensional quantum systems employing binary-outcome measurements (2018)

Mikołaj Czechlewski, Debashis Saha, Armin Tavakoli, and Marcin Pawłowski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-05

Beschreibung: Author(s): Mikołaj Czechlewski, Debashis Saha, Armin Tavakoli, and Marcin Pawłowski Device-independent dimension witnesses (DWs) are a remarkable way to test the dimension of a quantum system in a prepare-and-measure scenario imposing minimal assumptions on the internal features of the devices. However, as the dimension increases, the major obstacle in the realization of DWs arises... [Phys. Rev. A 98, 062305] Published Tue Dec 04, 2018

Schlagwort(e): Quantum information

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Complementary-multiphase quantum search for all numbers of target items (2018)

Tan Li, Wan-Su Bao, He-Liang Huang, Feng-Guang Li, Xiang-Qun Fu, Shuo Zhang, Chu Guo, Yu-Tao Du, Xiang Wang, and Jie Lin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-07

Beschreibung: Author(s): Tan Li, Wan-Su Bao, He-Liang Huang, Feng-Guang Li, Xiang-Qun Fu, Shuo Zhang, Chu Guo, Yu-Tao Du, Xiang Wang, and Jie Lin Grover's algorithm achieves a quadratic speedup over classical algorithms, but it is considered necessary to know the value of λ exactly [ Phys. Rev. Lett. 95 , 150501 (2005) ; Phys. Rev. Lett. 113 , 210501 (2014) ], where λ is the fraction of target items in the database. In this paper, we find out that... [Phys. Rev. A 98, 062308] Published Thu Dec 06, 2018

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Enhancing the efficiency of quantum annealing via reinforcement: A path-integral Monte Carlo simulation of the quantum reinforcement algorithm (2018)

A. Ramezanpour

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-07

Beschreibung: Author(s): A. Ramezanpour The standard quantum annealing algorithm tries to approach the ground state of a classical system by slowly decreasing the hopping rates of a quantum random walk in the configuration space of the problem, where the on-site energies are provided by the classical energy function. In a quantum reinforc... [Phys. Rev. A 98, 062309] Published Thu Dec 06, 2018

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Two-photon self-Kerr nonlinearities for quantum computing and quantum optics (2018)

Joshua Combes and Daniel J. Brod

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-11

Beschreibung: Author(s): Joshua Combes and Daniel J. Brod The self-Kerr interaction is an optical nonlinearity that produces a phase shift proportional to the square of the number of photons in the field. At present, many proposals use nonlinearities to generate photon-photon interactions. For propagating fields these interactions result in undesirable fea... [Phys. Rev. A 98, 062313] Published Mon Dec 10, 2018

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Simulating arbitrary Gaussian circuits with linear optics (2018)

L. Chakhmakhchyan and N. J. Cerf

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-11

Beschreibung: Author(s): L. Chakhmakhchyan and N. J. Cerf Linear canonical transformations of bosonic modes correspond to Gaussian unitaries, which comprise passive linear-optical transformations as effected by a multiport passive interferometer and active Bogoliubov transformations as effected by a nonlinear amplification medium. As a consequence of the B... [Phys. Rev. A 98, 062314] Published Mon Dec 10, 2018

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Approximate quantum state reconstruction without a quantum channel (2018)

Zichen Yang, Ze-Yang Fan, Liang-Zhu Mu, and Heng Fan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-12

Beschreibung: Author(s): Zichen Yang, Ze-Yang Fan, Liang-Zhu Mu, and Heng Fan We investigate the optimal quantum state reconstruction from the cloud to many spatially separated users by a measure-broadcast-prepare scheme without the availability of the quantum channel. The quantum state equally distributed from the cloud to an arbitrary number of users is generated at each po... [Phys. Rev. A 98, 062315] Published Tue Dec 11, 2018

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Imaging the Local Charge Environment of Nitrogen-Vacancy Centers in Diamond (2018)

T. Mittiga, S. Hsieh, C. Zu, B. Kobrin, F. Machado, P. Bhattacharyya, N. Z. Rui, A. Jarmola, S. Choi, D. Budker, and N. Y. Yao

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-13

Beschreibung: Author(s): T. Mittiga, S. Hsieh, C. Zu, B. Kobrin, F. Machado, P. Bhattacharyya, N. Z. Rui, A. Jarmola, S. Choi, D. Budker, and N. Y. Yao Nitrogen-vacancy centers in diamond are found to be more affected by local charge than expected, which has implications for the use of the defects as quantum sensors. [Phys. Rev. Lett. 121, 246402] Published Wed Dec 12, 2018

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$z=2$ Quantum Critical Dynamics in a Spin Ladder (2018)

D. Blosser, V. K. Bhartiya, D. J. Voneshen, and A. Zheludev

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): D. Blosser, V. K. Bhartiya, D. J. Voneshen, and A. Zheludev By means of inelastic neutron scattering we investigate finite temperature dynamics in the quantum spin ladder compound ( C 5 H 12 N ) 2 CuBr 4 (BPCB) near the magnetic field induced quantum critical point with dynamical exponent z = 2 . We observe universal finite-temperature scaling of the transverse local dy... [Phys. Rev. Lett. 121, 247201] Published Thu Dec 13, 2018

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Interactions and Magnetotransport through Spin-Valley Coupled Landau Levels in Monolayer ${\mathrm{MoS}}_{2}$ (2018)

Riccardo Pisoni, Andor Kormányos, Matthew Brooks, Zijin Lei, Patrick Back, Marius Eich, Hiske Overweg, Yongjin Lee, Peter Rickhaus, Kenji Watanabe, Takashi Taniguchi, Atac Imamoglu, Guido Burkard, Thomas Ihn, and Klaus Ensslin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Riccardo Pisoni, Andor Kormányos, Matthew Brooks, Zijin Lei, Patrick Back, Marius Eich, Hiske Overweg, Yongjin Lee, Peter Rickhaus, Kenji Watanabe, Takashi Taniguchi, Atac Imamoglu, Guido Burkard, Thomas Ihn, and Klaus Ensslin The strong spin-orbit coupling and the broken inversion symmetry in monolayer transition metal dichalcogenides results in spin-valley coupled band structures. Such a band structure leads to novel applications in the fields of electronics and optoelectronics. Density functional theory calculations as... [Phys. Rev. Lett. 121, 247701] Published Thu Dec 13, 2018

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Strongly Enhanced Berry Dipole at Topological Phase Transitions in BiTeI (2018)

Jorge I. Facio, Dmitri Efremov, Klaus Koepernik, Jhih-Shih You, Inti Sodemann, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): Jorge I. Facio, Dmitri Efremov, Klaus Koepernik, Jhih-Shih You, Inti Sodemann, and Jeroen van den Brink Transitions between topologically distinct electronic states have been predicted in different classes of materials and observed in some. A major goal is the identification of measurable properties that directly expose the topological nature of such transitions. Here, we focus on the giant Rashba mat... [Phys. Rev. Lett. 121, 246403] Published Fri Dec 14, 2018

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Quantum control with measurements and quantum Zeno dynamics (2018)

J. J. W. H. Sørensen, M. Dalgaard, A. H. Kiilerich, K. Mølmer, and J. F. Sherson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): J. J. W. H. Sørensen, M. Dalgaard, A. H. Kiilerich, K. Mølmer, and J. F. Sherson We introduce an efficient iterative method to prepare a target state in Hilbert spaces with high dimensionality using a combination of unitary evolution, measurements, and quantum Zeno dynamics. The latter confines the evolution within Zeno subspaces of decreasing size. This gives an exponential spe... [Phys. Rev. A 98, 062317] Published Fri Dec 14, 2018

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Activation of the quantum capacity of Gaussian channels (2018)

Youngrong Lim and Soojoon Lee

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Youngrong Lim and Soojoon Lee Quantum channels with no quantum capacity can be activated by specific kinds of channels. This activation effect might be useful to overcome noise of channels by attaching other channels, which can enhance the capacity of a given channel. We show that such an activation is possible by specific posit... [Phys. Rev. A 98, 012326] Published Wed Jul 25, 2018

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Dual correspondence between classical spin models and quantum Calderbank-Shor-Steane states (2018)

Mohammad Hossein Zarei and Afshin Montakhab

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-01

Beschreibung: Author(s): Mohammad Hossein Zarei and Afshin Montakhab The correspondence between classical spin models and quantum states has attracted much attention in recent years. However, it remains an open problem as to which specific spin model a given (well-known) quantum state maps. Here, we provide such an explicit correspondence for an important class of qu... [Phys. Rev. A 98, 012337] Published Tue Jul 31, 2018

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Quantum walk search on Kronecker graphs (2018)

Thomas G. Wong, Konstantin Wünscher, Joshua Lockhart, and Simone Severini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-01

Beschreibung: Author(s): Thomas G. Wong, Konstantin Wünscher, Joshua Lockhart, and Simone Severini Kronecker graphs, obtained by repeatedly performing the Kronecker product of the adjacency matrix of an “initiator” graph with itself, have risen in popularity in network science due to their ability to generate complex networks with real-world properties. We explore spatial search by continuous-tim... [Phys. Rev. A 98, 012338] Published Tue Jul 31, 2018

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Adaptive quantum tomography in high dimensions (2018)

L. Pereira, L. Zambrano, J. Cortés-Vega, S. Niklitschek, and A. Delgado

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-01

Beschreibung: Author(s): L. Pereira, L. Zambrano, J. Cortés-Vega, S. Niklitschek, and A. Delgado Standard quantum tomography of a single qudit achieves an infidelity that scales in the worst case as O ( 1 / N ) for a sample of size N . Here, we propose a suitable generalization of the two-stage adaptive quantum tomography for a qubit to the case of a single qudit. This achieves an infidelity of the o... [Phys. Rev. A 98, 012339] Published Tue Jul 31, 2018

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Nematicity and Charge Order in Superoxygenated ${\mathrm{La}}_{2−x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4+y}$ (2018)

Zhiwei Zhang, R. Sutarto, F. He, F. C. Chou, L. Udby, S. L. Holm, Z. H. Zhu, W. A. Hines, J. I. Budnick, and B. O. Wells

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Zhiwei Zhang, R. Sutarto, F. He, F. C. Chou, L. Udby, S. L. Holm, Z. H. Zhu, W. A. Hines, J. I. Budnick, and B. O. Wells In this Letter, we report a resonant x-ray scattering measurement of stripelike charge order in the 1/8th doped component of electronically phase-separated, orthorhombic La 2 CuO 4 + y . This observation is coupled to the absence of any resonant (001) peak, which at different resonant energies has been id... [Phys. Rev. Lett. 121, 067602] Published Wed Aug 08, 2018

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Electrical Reservoirs for Bilayer Excitons (2018)

Ming Xie and A. H. Mac; Donald

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Ming Xie and A. H. MacDonald The ground state of two-dimensional (2D) electron systems with equal low densities of electrons and holes in nearby layers is an exciton fluid. We show that a reservoir for excitons can be established by contacting the two layers separately and maintaining the chemical potential difference at a valu... [Phys. Rev. Lett. 121, 067702] Published Wed Aug 08, 2018

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Correlation-Driven Dimerization and Topological Gap Opening in Isotropically Strained Graphene (2018)

Sandro Sorella, Kazuhiro Seki, Oleg O. Brovko, Tomonori Shirakawa, Shohei Miyakoshi, Seiji Yunoki, and Erio Tosatti

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Sandro Sorella, Kazuhiro Seki, Oleg O. Brovko, Tomonori Shirakawa, Shohei Miyakoshi, Seiji Yunoki, and Erio Tosatti The phase diagram of isotropically expanded graphene cannot be correctly predicted by ignoring either electron correlations, or mobile carbons, or the effect of applied stress, as was done so far. We calculate the ground state enthalpy (not just energy) of strained graphene by an accurate off-lattic... [Phys. Rev. Lett. 121, 066402] Published Wed Aug 08, 2018

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Spin Waves in Detwinned ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ (2018)

Xingye Lu, Daniel D. Scherer, David W. Tam, Wenliang Zhang, Rui Zhang, Huiqian Luo, Leland W. Harriger, H. C. Walker, D. T. Adroja, Brian M. Andersen, and Pengcheng Dai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Xingye Lu, Daniel D. Scherer, David W. Tam, Wenliang Zhang, Rui Zhang, Huiqian Luo, Leland W. Harriger, H. C. Walker, D. T. Adroja, Brian M. Andersen, and Pengcheng Dai Understanding magnetic interactions in the parent compounds of high-temperature superconductors forms the basis for determining their role for the mechanism of superconductivity. For parent compounds of iron pnictide superconductors such as A Fe 2 As 2 ( A = Ba , Ca, Sr), although spin excitations have been... [Phys. Rev. Lett. 121, 067002] Published Wed Aug 08, 2018

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Enhanced entanglement criterion via symmetric informationally complete measurements (2018)

Jiangwei Shang, Ali Asadian, Huangjun Zhu, and Otfried Gühne

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-11

Beschreibung: Author(s): Jiangwei Shang, Ali Asadian, Huangjun Zhu, and Otfried Gühne The challenges of entanglement detection lead to the development of several entanglement measures and criteria. Here a special type of measurement is used to attest entanglement in a stronger way, i.e. it catches forms that are missed by other criteria and is effective in a single-shot fashion. [Phys. Rev. A 98, 022309] Published Fri Aug 10, 2018

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Experimental distillation of bipartite polarization entanglement using polarizing Mach-Zehnder interferometers (2018)

Chithrabhanu Perumangatt, Tang Zong Sheng, and Alexander Ling

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-14

Beschreibung: Author(s): Chithrabhanu Perumangatt, Tang Zong Sheng, and Alexander Ling Entanglement distillation is the process of concentrating entanglement from a given quantum state. We present a technique for distillation of bipartite polarization entanglement using interferometry. This technique can be optimized to extract maximal entanglement from any pure or mixed entangled sta... [Phys. Rev. A 98, 022313] Published Mon Aug 13, 2018

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Central Charge of Periodically Driven Critical Kitaev Chains (2018)

Daniel Yates, Yonah Lemonik, and Aditi Mitra

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): Daniel Yates, Yonah Lemonik, and Aditi Mitra Periodically driven Kitaev chains show a rich phase diagram as the amplitude and frequency of the drive is varied, with topological phase transitions separating regions with different number of Majorana zero and π modes. We explore whether the critical point separating different phases of the period... [Phys. Rev. Lett. 121, 076802] Published Tue Aug 14, 2018

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Spin Lifetime and Charge Noise in Hot Silicon Quantum Dot Qubits (2018)

L. Petit, J. M. Boter, H. G. J. Eenink, G. Droulers, M. L. V. Tagliaferri, R. Li, D. P. Franke, K. J. Singh, J. S. Clarke, R. N. Schouten, V. V. Dobrovitski, L. M. K. Vandersypen, and M. Veldhorst

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): L. Petit, J. M. Boter, H. G. J. Eenink, G. Droulers, M. L. V. Tagliaferri, R. Li, D. P. Franke, K. J. Singh, J. S. Clarke, R. N. Schouten, V. V. Dobrovitski, L. M. K. Vandersypen, and M. Veldhorst We investigate the magnetic field and temperature dependence of the single-electron spin lifetime in silicon quantum dots and find a lifetime of 2.8 ms at a temperature of 1.1 K. We develop a model based on spin-valley mixing and find that Johnson noise and two-phonon processes limit relaxation at l... [Phys. Rev. Lett. 121, 076801] Published Tue Aug 14, 2018

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Temperature Controlled Fulde-Ferrell-Larkin-Ovchinnikov Instability in Superconductor-Ferromagnet Hybrids (2018)

S. V. Mironov, D. Yu. Vodolazov, Y. Yerin, A. V. Samokhvalov, A. S. Mel’nikov, and A. Buzdin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): S. V. Mironov, D. Yu. Vodolazov, Y. Yerin, A. V. Samokhvalov, A. S. Mel’nikov, and A. Buzdin We show that a wide class of layered superconductor-ferromagnet ( S / F ) hybrids demonstrates the emergence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase well below the superconducting transition temperature. By decreasing the temperature, one can switch the system from uniform to the FFLO state... [Phys. Rev. Lett. 121, 077002] Published Wed Aug 15, 2018

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From Kinetic Instability to Bose-Einstein Condensation and Magnon Supercurrents (2018)

Alexander J. E. Kreil, Dmytro A. Bozhko, Halyna Yu. Musiienko-Shmarova, Vitaliy I. Vasyuchka, Victor S. L’vov, Anna Pomyalov, Burkard Hillebrands, and Alexander A. Serga

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): Alexander J. E. Kreil, Dmytro A. Bozhko, Halyna Yu. Musiienko-Shmarova, Vitaliy I. Vasyuchka, Victor S. L’vov, Anna Pomyalov, Burkard Hillebrands, and Alexander A. Serga Evolution of an overpopulated gas of magnons to a Bose-Einstein condensate and excitation of a magnon supercurrent, propelled by a phase gradient in the condensate wave function, can be observed at room temperature by means of the Brillouin light scattering spectroscopy in an yttrium iron garnet mat... [Phys. Rev. Lett. 121, 077203] Published Wed Aug 15, 2018

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Entanglement sudden death and revival in quantum dark-soliton qubits (2018)

Muzzamal I. Shaukat, Eduardo V. Castro, and Hugo Terças

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-17

Beschreibung: Author(s): Muzzamal I. Shaukat, Eduardo V. Castro, and Hugo Terças We study the finite time entanglement dynamics between two dark-soliton qubits due to quantum fluctuations in quasi-one-dimensional Bose-Einstein condensates. Recently, dark solitons are proved to be an appealing platform for qubits due to their appreciably long lifetime. We explore the entanglement... [Phys. Rev. A 98, 022319] Published Thu Aug 16, 2018

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Genuine multipartite concurrence for entanglement of Dirac fields in noninertial frames (2018)

Wen-Chao Qiang, Guo-Hua Sun, Qian Dong, and Shi-Hai Dong

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-18

Beschreibung: Author(s): Wen-Chao Qiang, Guo-Hua Sun, Qian Dong, and Shi-Hai Dong We apply genuine multipartite entanglement concurrence to investigate entanglement properties of Dirac fields in noninertial frames. We present analytical concurrences for bipartite and tripartite entanglements simultaneously, which enriches previous results. We note that the entanglement of the Gre... [Phys. Rev. A 98, 022320] Published Fri Aug 17, 2018

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Influence of Spin-Orbit Coupling in Iron-Based Superconductors (2018)

R. P. Day, G. Levy, M. Michiardi, B. Zwartsenberg, M. Zonno, F. Ji, E. Razzoli, F. Boschini, S. Chi, R. Liang, P. K. Das, I. Vobornik, J. Fujii, W. N. Hardy, D. A. Bonn, I. S. Elfimov, and A. Damascelli

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-18

Beschreibung: Author(s): R. P. Day, G. Levy, M. Michiardi, B. Zwartsenberg, M. Zonno, F. Ji, E. Razzoli, F. Boschini, S. Chi, R. Liang, P. K. Das, I. Vobornik, J. Fujii, W. N. Hardy, D. A. Bonn, I. S. Elfimov, and A. Damascelli We report on the influence of spin-orbit coupling (SOC) in Fe-based superconductors via application of circularly polarized spin and angle-resolved photoemission spectroscopy. We combine this technique in representative members of both the Fe-pnictides (LiFeAs) and Fe-chalcogenides (FeSe) with tight... [Phys. Rev. Lett. 121, 076401] Published Fri Aug 17, 2018

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Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates (2018)

M. Horio et al.

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-18

Beschreibung: Author(s): M. Horio et al. We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident photon energy. No k z dispersion is observed along the nodal ... [Phys. Rev. Lett. 121, 077004] Published Fri Aug 17, 2018

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Single-Site Non-Fermi-Liquid Behaviors in a Diluted $4{f}^{2}$ System ${\mathrm{Y}}_{1−x}{\mathrm{Pr}}_{x}{\mathrm{Ir}}_{2}{\mathrm{Zn}}_{20}$ (2018)

Y. Yamane, T. Onimaru, K. Wakiya, K. T. Matsumoto, K. Umeo, and T. Takabatake

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-18

Beschreibung: Author(s): Y. Yamane, T. Onimaru, K. Wakiya, K. T. Matsumoto, K. Umeo, and T. Takabatake Electrical resistivity ρ ( T ) and specific heat C ( T ) measurements have been made on the diluted 4 f 2 system Y ( Pr ) Ir 2 Zn 20 . Both data of ρ and magnetic specific heat C m per Pr ion are well scaled as a function of T / T 0 , where T 0 is a characteristic temperature of non-Fermi-liquid (NFL) behaviors. Furtherm... [Phys. Rev. Lett. 121, 077206] Published Fri Aug 17, 2018

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Magnetic Exchange Fields and Domain Wall Superconductivity at an All-Oxide Superconductor-Ferromagnet Insulator Interface (2018)

S. Komori, A. Di Bernardo, A. I. Buzdin, M. G. Blamire, and J. W. A. Robinson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-18

Beschreibung: Author(s): S. Komori, A. Di Bernardo, A. I. Buzdin, M. G. Blamire, and J. W. A. Robinson At a superconductor-ferromagnet ( S / F ) interface, the F layer can introduce a magnetic exchange field within the S layer, which acts to locally spin split the superconducting density of states. The effect of magnetic exchange fields on superconductivity has been thoroughly explored at S -ferromagnet i... [Phys. Rev. Lett. 121, 077003] Published Fri Aug 17, 2018

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Quantum algorithms for electronic structure calculations: Particle-hole Hamiltonian and optimized wave-function expansions (2018)

Panagiotis Kl. Barkoutsos, Jerome F. Gonthier, Igor Sokolov, Nikolaj Moll, Gian Salis, Andreas Fuhrer, Marc Ganzhorn, Daniel J. Egger, Matthias Troyer, Antonio Mezzacapo, Stefan Filipp, and Ivano Tavernelli

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Panagiotis Kl. Barkoutsos, Jerome F. Gonthier, Igor Sokolov, Nikolaj Moll, Gian Salis, Andreas Fuhrer, Marc Ganzhorn, Daniel J. Egger, Matthias Troyer, Antonio Mezzacapo, Stefan Filipp, and Ivano Tavernelli In this work we investigate methods to improve the efficiency and scalability of quantum algorithms for quantum chemistry applications. We propose a transformation of the electronic structure Hamiltonian in the second quantization framework into the particle-hole picture, which offers a better start... [Phys. Rev. A 98, 022322] Published Mon Aug 20, 2018

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Critical slowing down of multiatom entanglement by Rydberg blockade (2018)

Tahereh Abad and Klaus Mølmer

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Tahereh Abad and Klaus Mølmer Laser excitation pulses that lead to perfect adiabatic state transfer in an ensemble of three-level ladder atoms lead to highly entangled states of many atoms if their highest excited state is subject to Rydberg blockade. Solution of the Schrödinger equation shows that it is increasingly difficult t... [Phys. Rev. A 98, 022324] Published Tue Aug 21, 2018

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Fractionalized Metal in a Falicov-Kimball Model (2018)

Martin Hohenadler and Fakher F. Assaad

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Martin Hohenadler and Fakher F. Assaad Quantum Monte Carlo simulations reveal an exotic metallic phase with a single-particle gap but gapless spin and charge excitations and a nonsaturating resistivity in a two-dimensional SU(2) Falicov-Kimball model. An exact duality between this model and an unconstrained slave-spin theory leads to a c... [Phys. Rev. Lett. 121, 086601] Published Tue Aug 21, 2018

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Inter-Landau-level Andreev Reflection at the Dirac Point in a Graphene Quantum Hall State Coupled to a ${\mathrm{NbSe}}_{2}$ Superconductor (2018)

Manas Ranjan Sahu, Xin Liu, Arup Kumar Paul, Sourin Das, Pratap Raychaudhuri, J. K. Jain, and Anindya Das

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Manas Ranjan Sahu, Xin Liu, Arup Kumar Paul, Sourin Das, Pratap Raychaudhuri, J. K. Jain, and Anindya Das Superconductivity and the quantum Hall effect are distinct states of matter occurring in apparently incompatible physical conditions. Recent theoretical developments suggest that the coupling of the quantum Hall effect with a superconductor can provide fertile ground for realizing exotic topological... [Phys. Rev. Lett. 121, 086809] Published Fri Aug 24, 2018

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Fast Detection of a Weak Signal by a Stochastic Resonance Induced by a Coherence Resonance in an Excitable $\mathrm{GaAs}/{\mathrm{Al}}_{0.45}{\mathrm{Ga}}_{0.55}\mathrm{As}$ Superlattice (2018)

Zhengzheng Shao, Zhizhen Yin, Helun Song, Wei Liu, Xiujian Li, Jubo Zhu, Klaus Biermann, Luis L. Bonilla, Holger T. Grahn, and Yaohui Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Zhengzheng Shao, Zhizhen Yin, Helun Song, Wei Liu, Xiujian Li, Jubo Zhu, Klaus Biermann, Luis L. Bonilla, Holger T. Grahn, and Yaohui Zhang The effect of a coherence resonance is observed experimentally in a GaAs / Al 0.45 Ga 0.55 As superlattice under dc bias at room temperature, which is driven by noise. For an applied voltage, for which no current self-oscillations are observed, regular current self-oscillations with a frequency of about 8... [Phys. Rev. Lett. 121, 086806] Published Fri Aug 24, 2018

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Symmetry-Protected Topological Metals (2018)

Xuzhe Ying and Alex Kamenev

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Xuzhe Ying and Alex Kamenev We show that sharply defined topological quantum phase transitions are not limited to states of matter with gapped electronic spectra. Such transitions may also occur between two gapless metallic states both with extended Fermi surfaces. The transition is characterized by a discontinuous, but not qu... [Phys. Rev. Lett. 121, 086810] Published Fri Aug 24, 2018

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Measurement of the Entanglement Spectrum of a Symmetry-Protected Topological State Using the IBM Quantum Computer (2018)

Kenny Choo, Curt W. von Keyserlingk, Nicolas Regnault, and Titus Neupert

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Kenny Choo, Curt W. von Keyserlingk, Nicolas Regnault, and Titus Neupert Entanglement properties are routinely used to characterize phases of quantum matter in theoretical computations. For example, the spectrum of the reduced density matrix, or so-called “entanglement spectrum”, has become a widely used diagnostic for universal topological properties of quantum phases. ... [Phys. Rev. Lett. 121, 086808] Published Fri Aug 24, 2018

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Coherence Resonance and Stochastic Resonance in an Excitable Semiconductor Superlattice (2018)

Emanuel Mompo, Miguel Ruiz-Garcia, Manuel Carretero, Holger T. Grahn, Yaohui Zhang, and Luis L. Bonilla

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Emanuel Mompo, Miguel Ruiz-Garcia, Manuel Carretero, Holger T. Grahn, Yaohui Zhang, and Luis L. Bonilla Collective electron transport causes a weakly coupled semiconductor superlattice under dc voltage bias to be an excitable system with 2 N + 2 degrees of freedom: electron densities and fields at N superlattice periods plus the total current and the field at the injector. External noise of sufficient am... [Phys. Rev. Lett. 121, 086805] Published Fri Aug 24, 2018

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Monopole-Induced Emergent Electric Fields in Ferromagnetic Nanowires (2018)

Michalis Charilaou, Hans-Benjamin Braun, and Jörg F. Löffler

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-29

Beschreibung: Author(s): Michalis Charilaou, Hans-Benjamin Braun, and Jörg F. Löffler We predict that complete magnetization reversal in simple metallic ferromagnetic nanoparticles is directly linked to the pair creation of topological point defects in the form of hedgehog-antihedgehog pairs. These dynamical point defects move at exceptionally high speeds in excess of 1500 m / s , fast... [Phys. Rev. Lett. 121, 097202] Published Tue Aug 28, 2018

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Quantum extension of variational Bayes inference (2018)

Hideyuki Miyahara and Yuki Sughiyama

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-08-30

Beschreibung: Author(s): Hideyuki Miyahara and Yuki Sughiyama Variational Bayes (VB) inference is one of the most important algorithms in machine learning and is widely used in engineering and industry. However, VB is known to suffer from the problem of local optima. In this paper, we generalize VB by using quantum mechanics and propose an algorithm, which we ... [Phys. Rev. A 98, 022330] Published Wed Aug 29, 2018

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Thermally Driven Out-of-Equilibrium Two-Impurity Kondo System (2018)

Miguel A. Sierra, Rosa López, and Jong Soo Lim

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-30

Beschreibung: Author(s): Miguel A. Sierra, Rosa López, and Jong Soo Lim The archetypal two-impurity Kondo problem in a serially coupled double quantum dot is investigated in the presence of a thermal bias θ . The slave-boson formulation is employed to obtain the nonlinear thermal and thermoelectrical responses. When the Kondo correlations prevail over the antiferromagnet... [Phys. Rev. Lett. 121, 096801] Published Wed Aug 29, 2018

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Experimental classification of entanglement in arbitrary three-qubit pure states on an NMR quantum information processor (2018)

Amandeep Singh, Harpreet Singh, Kavita Dorai, and Arvind

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Amandeep Singh, Harpreet Singh, Kavita Dorai, and Arvind We undertake experimental detection of the entanglement present in arbitrary three-qubit pure quantum states on an NMR quantum information processor. Measurements of only four observables suffice to experimentally differentiate between the six classes of states which are inequivalent under stochasti... [Phys. Rev. A 98, 032301] Published Tue Sep 04, 2018

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Imbalance entanglement: Symmetry decomposition of negativity (2018)

Eyal Cornfeld, Moshe Goldstein, and Eran Sela

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Eyal Cornfeld, Moshe Goldstein, and Eran Sela In the presence of symmetry, entanglement measures of quantum many-body states can be decomposed into contributions from distinct symmetry sectors. Here we investigate the decomposability of negativity, a measure of entanglement between two parts of a generally open system in a mixed state. While th... [Phys. Rev. A 98, 032302] Published Tue Sep 04, 2018

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Efficient measurement-device-independent quantum key distribution without vacuum sources (2018)

Xiao-Long Hu, Zong-Wen Yu, and Xiang-Bin Wang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Xiao-Long Hu, Zong-Wen Yu, and Xiang-Bin Wang We present an efficient decoy-state protocol measurement-device-independent quantum key distribution without vacuum source, with the heralded single-photon source (HSPS) and global optimization. This protocol is able to give a high key rate and avoid the security problem caused by the vacuum source ... [Phys. Rev. A 98, 032303] Published Tue Sep 04, 2018

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One-step construction of the multiple-qubit Rydberg controlled- phase gate (2018)

S. L. Su, H. Z. Shen, Erjun Liang, and Shou Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-07

Beschreibung: Author(s): S. L. Su, H. Z. Shen, Erjun Liang, and Shou Zhang Although the three-body Rydberg antiblockade regime (RABR) can produce Rabi oscillation between the Rydberg collective excited state and the collective ground state, it is still hard to use the RABR to construct the three-qubit quantum logic gate in one step since the effective Hamiltonian is always... [Phys. Rev. A 98, 032306] Published Thu Sep 06, 2018

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Imaging the Zigzag Wigner Crystal in Confinement-Tunable Quantum Wires (2018)

Sheng-Chin Ho, Heng-Jian Chang, Chia-Hua Chang, Shun-Tsung Lo, Graham Creeth, Sanjeev Kumar, Ian Farrer, David Ritchie, Jonathan Griffiths, Geraint Jones, Michael Pepper, and Tse-Ming Chen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-07

Beschreibung: Author(s): Sheng-Chin Ho, Heng-Jian Chang, Chia-Hua Chang, Shun-Tsung Lo, Graham Creeth, Sanjeev Kumar, Ian Farrer, David Ritchie, Jonathan Griffiths, Geraint Jones, Michael Pepper, and Tse-Ming Chen Using a nanowire with controllable width, researchers have created a type of Wigner crystal in which electrons form an ordered zigzag pattern. [Phys. Rev. Lett. 121, 106801] Published Thu Sep 06, 2018

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Noise-Induced Backscattering in a Quantum Spin Hall Edge (2018)

Jukka I. Väyrynen, Dmitry I. Pikulin, and Jason Alicea

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-07

Beschreibung: Author(s): Jukka I. Väyrynen, Dmitry I. Pikulin, and Jason Alicea The observed imperfect conductance quantization in 2D topological insulators may be due to time-dependent electronic noise from charge puddles. [Phys. Rev. Lett. 121, 106601] Published Thu Sep 06, 2018

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Quantum circuit learning (2018)

K. Mitarai, M. Negoro, M. Kitagawa, and K. Fujii

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-11

Beschreibung: Author(s): K. Mitarai, M. Negoro, M. Kitagawa, and K. Fujii We propose a classical-quantum hybrid algorithm for machine learning on near-term quantum processors, which we call quantum circuit learning. A quantum circuit driven by our framework learns a given task by tuning parameters implemented on it. The iterative optimization of the parameters allows us t... [Phys. Rev. A 98, 032309] Published Mon Sep 10, 2018

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Entangled histories versus the two-state-vector formalism: Towards a better understanding of quantum temporal correlations (2018)

Marcin Nowakowski, Eliahu Cohen, and Pawel Horodecki

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-11

Beschreibung: Author(s): Marcin Nowakowski, Eliahu Cohen, and Pawel Horodecki The two-state-vector formalism and the entangled histories formalism are attempts to better understand quantum correlations in time. Both formalisms share some similarities, but they are not identical, having subtle differences in their interpretation and manipulation of quantum temporal structures.... [Phys. Rev. A 98, 032312] Published Mon Sep 10, 2018

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Generation and stabilization of entangled coherent states for the vibrational modes of a trapped ion (2018)

Zhi-Rong Zhong, Xin-Jie Huang, Zhen-Biao Yang, Li-Tuo Shen, and Shi-Biao Zheng

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-11

Beschreibung: Author(s): Zhi-Rong Zhong, Xin-Jie Huang, Zhen-Biao Yang, Li-Tuo Shen, and Shi-Biao Zheng We propose a scheme for preparation of entangled coherent states for the motion of an ion in a two-dimensional anisotropic trap. In the scheme, the ion is driven by four laser beams along different directions in the ion trap plane, resulting in carrier excitation and couplings between the internal a... [Phys. Rev. A 98, 032311] Published Mon Sep 10, 2018

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Spontaneous Exact Spin-Wave Fractals in Magnonic Crystals (2018)

Daniel Richardson, Boris A. Kalinikos, Lincoln D. Carr, and Mingzhong Wu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-08

Beschreibung: Author(s): Daniel Richardson, Boris A. Kalinikos, Lincoln D. Carr, and Mingzhong Wu Exact fractals of nonlinear waves that rely on strong dispersion and nonlinearity and arise spontaneously out of magnetic media were observed for the first time. The experiments make use of a microwave to excite a spin wave in a quasi-one-dimensional magnonic crystal. When the power of the input mic... [Phys. Rev. Lett. 121, 107204] Published Fri Sep 07, 2018

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Nonadiabatic holonomic quantum computation with Rydberg superatoms (2018)

P. Z. Zhao, X. Wu, T. H. Xing, G. F. Xu, and D. M. Tong

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-12

Beschreibung: Author(s): P. Z. Zhao, X. Wu, T. H. Xing, G. F. Xu, and D. M. Tong Nonadiabatic holonomic quantum computation has received increasing attention due to its robustness against control errors as well as high-speed realization. Several schemes of its implementation have been put forward based on various physical systems, each of which has some particular merits. In thi... [Phys. Rev. A 98, 032313] Published Tue Sep 11, 2018

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Gaussian one-way thermal quantum cryptography with finite-size effects (2018)

Panagiotis Papanastasiou, Carlo Ottaviani, and Stefano Pirandola

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-12

Beschreibung: Author(s): Panagiotis Papanastasiou, Carlo Ottaviani, and Stefano Pirandola We study the impact of finite-size effects on the security of thermal one-way quantum cryptography. Our approach considers coherent and/or squeezed states at the preparation stage, on the top of which the sender adds trusted thermal noise. We compute the key rate incorporating finite-size effects, a... [Phys. Rev. A 98, 032314] Published Tue Sep 11, 2018

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Binary Two-Dimensional Honeycomb Lattice with Strong Spin-Orbit Coupling and Electron-Hole Asymmetry (2018)

Jian Gou, Bingyu Xia, Hang Li, Xuguang Wang, Longjuan Kong, Peng Cheng, Hui Li, Weifeng Zhang, Tian Qian, Hong Ding, Yong Xu, Wenhui Duan, Kehui Wu, and Lan Chen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): Jian Gou, Bingyu Xia, Hang Li, Xuguang Wang, Longjuan Kong, Peng Cheng, Hui Li, Weifeng Zhang, Tian Qian, Hong Ding, Yong Xu, Wenhui Duan, Kehui Wu, and Lan Chen A honeycomb structure of Bi and Sn atoms on a Si substrate has a pronounced electron-hole asymmetry, providing a platform to explore applications in nanodevices. [Phys. Rev. Lett. 121, 126801] Published Mon Sep 17, 2018

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Thermal Critical Points and Quantum Critical End Point in the Frustrated Bilayer Heisenberg Antiferromagnet (2018)

J. Stapmanns, P. Corboz, F. Mila, A. Honecker, B. Normand, and S. Wessel

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): J. Stapmanns, P. Corboz, F. Mila, A. Honecker, B. Normand, and S. Wessel We consider the finite-temperature phase diagram of the S = 1 / 2 frustrated Heisenberg bilayer. Although this two-dimensional system may show magnetic order only at zero temperature, we demonstrate the presence of a line of finite-temperature critical points related to the line of first-order transitio... [Phys. Rev. Lett. 121, 127201] Published Mon Sep 17, 2018

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Entangling an arbitrary pair of qubits in a long ion crystal (2018)

Pak Hong Leung and Kenneth R. Brown

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2018-09-19

Beschreibung: Author(s): Pak Hong Leung and Kenneth R. Brown It is well established that the collective motion of ion crystals can be used as a quantum bus for multiqubit entanglement. However, as the number of ions increases, it becomes difficult to directly entangle ions far apart and resolve all motional modes of the ion crystal. We introduce a scalable an... [Phys. Rev. A 98, 032318] Published Tue Sep 18, 2018

Schlagwort(e): Quantum information

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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Strong and Tunable Spin-Lifetime Anisotropy in Dual-Gated Bilayer Graphene (2018)

Jinsong Xu, Tiancong Zhu, Yunqiu Kelly Luo, Yuan-Ming Lu, and Roland K. Kawakami

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-21

Beschreibung: Author(s): Jinsong Xu, Tiancong Zhu, Yunqiu Kelly Luo, Yuan-Ming Lu, and Roland K. Kawakami Two groups have shown they can create long-lived, polarized spin currents in bilayer graphene. [Phys. Rev. Lett. 121, 127703] Published Thu Sep 20, 2018

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

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Mirage Andreev Spectra Generated by Mesoscopic Leads in Nanowire Quantum Dots (2018)

Z. Su, A. Zarassi, J.-F. Hsu, P. San-Jose, E. Prada, R. Aguado, E. J. H. Lee, S. Gazibegovic, R. L. M. Op het Veld, D. Car, S. R. Plissard, M. Hocevar, M. Pendharkar, J. S. Lee, J. A. Logan, C. J. Palmstrøm, E. P. A. M. Bakkers, and S. M. Frolov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-21

Beschreibung: Author(s): Z. Su, A. Zarassi, J.-F. Hsu, P. San-Jose, E. Prada, R. Aguado, E. J. H. Lee, S. Gazibegovic, R. L. M. Op het Veld, D. Car, S. R. Plissard, M. Hocevar, M. Pendharkar, J. S. Lee, J. A. Logan, C. J. Palmstrøm, E. P. A. M. Bakkers, and S. M. Frolov We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN / InSb devices, Andreev spectra of the dot appear to be repli... [Phys. Rev. Lett. 121, 127705] Published Thu Sep 20, 2018

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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