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Effect of non-Gaussian lensing deflections on CMB lensing measurements (2018)

Vanessa Böhm, Blake D. Sherwin, Jia Liu, J. Colin Hill, Marcel Schmittfull, and Toshiya Namikawa

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Vanessa Böhm, Blake D. Sherwin, Jia Liu, J. Colin Hill, Marcel Schmittfull, and Toshiya Namikawa We investigate the impact of non-Gaussian lensing deflections on measurements of the CMB lensing power spectrum. We find that the false assumption of their Gaussianity significantly biases these measurements in current and future experiments at the percent level. The bias is detected by comparing CM... [Phys. Rev. D 98, 123510] Published Thu Dec 13, 2018

Schlagwort(e): Cosmology

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Multiple Singularities of the Equilibrium Free Energy in a One-Dimensional Model of Soft Rods (2018)

Sushant Saryal, Juliane U. Klamser, Tridib Sadhu, and Deepak Dhar

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Sushant Saryal, Juliane U. Klamser, Tridib Sadhu, and Deepak Dhar There is a misconception, widely shared among physicists, that the equilibrium free energy of a one-dimensional classical model with strictly finite-ranged interactions, and at nonzero temperatures, cannot show any singularities as a function of the coupling constants. In this Letter, we discuss an ... [Phys. Rev. Lett. 121, 240601] Published Thu Dec 13, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Merger rate of a subdominant population of primordial black holes (2018)

Bradley J. Kavanagh, Daniele Gaggero, and Gianfranco Bertone

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Bradley J. Kavanagh, Daniele Gaggero, and Gianfranco Bertone The formation of astrophysical and primordial black holes influences the distribution of dark matter surrounding them. Black holes are thus expected to carry a dark matter “dress” whose properties depend on their formation mechanism and on the properties of the environment. Here we carry out a numer... [Phys. Rev. D 98, 023536] Published Wed Jul 25, 2018

Schlagwort(e): Cosmology

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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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Impact of the cosmic variance on ${H}_{0}$ on cosmological analyses (2018)

David Camarena and Valerio Marra

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): David Camarena and Valerio Marra The current 3.8 σ tension between local [A. G. Riess et al. , arXiv:1804.10655 .] and global [N. Aghanim et al. (Planck Collaboration), Astron. Astrophys. 596 , A107 (2016) .] measurements of H 0 cannot be fully explained by the concordance Λ CDM model. It could be produced by unknown systematics or by p... [Phys. Rev. D 98, 023537] Published Wed Jul 25, 2018

Schlagwort(e): Cosmology

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Linear point standard ruler for galaxy survey data: Validation with mock catalogs (2018)

Stefano Anselmi, Pier-Stefano Corasaniti, Glenn D. Starkman, Ravi K. Sheth, and Idit Zehavi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-26

Beschreibung: Author(s): Stefano Anselmi, Pier-Stefano Corasaniti, Glenn D. Starkman, Ravi K. Sheth, and Idit Zehavi Due to late-time nonlinearities, the location of the acoustic peak in the two-point galaxy correlation function is a redshift-dependent quantity, and thus it cannot be simply employed as a cosmological standard ruler. This has motivated the recent proposal of a novel ruler, also located in the baryo... [Phys. Rev. D 98, 023527] Published Wed Jul 25, 2018

Schlagwort(e): Cosmology

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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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Quantum Generative Adversarial Learning (2018)

Seth Lloyd and Christian Weedbrook

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-27

Beschreibung: Author(s): Seth Lloyd and Christian Weedbrook Researchers have mathematically proven that a powerful classical machine learning algorithm should work on quantum computers. [Phys. Rev. Lett. 121, 040502] Published Thu Jul 26, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Exploring axionlike particles beyond the canonical setup (2018)

Gonzalo Alonso-Álvarez and Joerg Jaeckel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-28

Beschreibung: Author(s): Gonzalo Alonso-Álvarez and Joerg Jaeckel Axionlike particles (ALPs) are interesting dark matter candidates from both the theoretical and the experimental perspective. Usually they are motivated as pseudo-Nambu-Goldstone bosons. In this case one of their most important features is that their coupling to other particles is suppressed by a la... [Phys. Rev. D 98, 023539] Published Fri Jul 27, 2018

Schlagwort(e): Cosmology

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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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Connections between Mutually Unbiased Bases and Quantum Random Access Codes (2018)

Edgar A. Aguilar, Jakub J. Borkała, Piotr Mironowicz, and Marcin Pawłowski

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-31

Beschreibung: Author(s): Edgar A. Aguilar, Jakub J. Borkała, Piotr Mironowicz, and Marcin Pawłowski We present a new quantum communication complexity protocol, the promise-quantum random access code, which allows us to introduce a new measure of unbiasedness for bases of Hilbert spaces. The proposed measure possesses a clear operational meaning and can be used to investigate whether a specific num... [Phys. Rev. Lett. 121, 050501] Published Mon Jul 30, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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Higgs field-curvature coupling and postinflationary vacuum instability (2018)

Daniel G. Figueroa, Arttu Rajantie, and Francisco Torrenti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Daniel G. Figueroa, Arttu Rajantie, and Francisco Torrenti We study the postinflationary dynamics of the Standard Model (SM) Higgs field in the presence of a nonminimal coupling ξ | Φ | 2 R to gravity, both with and without the electroweak gauge fields coupled to the Higgs field. We assume a minimal scenario in which inflation and reheating are caused by chaotic... [Phys. Rev. D 98, 023532] Published Tue Jul 24, 2018

Schlagwort(e): Cosmology

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Mitigating foreground biases in CMB lensing reconstruction using cleaned gradients (2018)

Mathew S. Madhavacheril and J. Colin Hill

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Mathew S. Madhavacheril and J. Colin Hill Reconstructed maps of the lensing convergence of the cosmic microwave background (CMB) will play a major role in precision cosmology in coming years. CMB lensing maps will enable calibration of the masses of high-redshift galaxy clusters and will yield precise measurements of the growth of cosmic st... [Phys. Rev. D 98, 023534] Published Tue Jul 24, 2018

Schlagwort(e): Cosmology

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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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Suppression of Heating in Quantum Spin Clusters under Periodic Driving as a Dynamic Localization Effect (2018)

Kai Ji and Boris V. Fine

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): Kai Ji and Boris V. Fine We investigate numerically and analytically the heating process in ergodic clusters of interacting spins 1 / 2 subjected to periodic pulses of an external magnetic field. Our findings indicate that there is a threshold for the pulse strength below which the heating is suppressed. This threshold decrea... [Phys. Rev. Lett. 121, 050602] Published Fri Aug 03, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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Lagrangian theory of structure formation in relativistic cosmology. V. Irrotational fluids (2018)

Yong-Zhuang Li, Pierre Mourier, Thomas Buchert, and David L. Wiltshire

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Yong-Zhuang Li, Pierre Mourier, Thomas Buchert, and David L. Wiltshire We extend the general relativistic Lagrangian perturbation theory, recently developed for the formation of cosmic structures in a dust continuum, to the case of model universes containing a single fluid with a single-valued analytic equation of state. Using a coframe-based perturbation approach, we ... [Phys. Rev. D 98, 043507] Published Tue Aug 07, 2018

Schlagwort(e): Cosmology

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Spectral Statistics in Spatially Extended Chaotic Quantum Many-Body Systems (2018)

Amos Chan, Andrea De Luca, and J. T. Chalker

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Amos Chan, Andrea De Luca, and J. T. Chalker We study spectral statistics in spatially extended chaotic quantum many-body systems, using simple lattice Floquet models without time-reversal symmetry. Computing the spectral form factor K ( t ) analytically and numerically, we show that it follows random matrix theory (RMT) at times longer than a ma... [Phys. Rev. Lett. 121, 060601] Published Tue Aug 07, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Imprints of gravitational lensing in the Planck cosmic microwave background data at the location of $WISE×\mathrm{SCOS}$ galaxies (2018)

Srinivasan Raghunathan, Federico Bianchini, and Christian L. Reichardt

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Srinivasan Raghunathan, Federico Bianchini, and Christian L. Reichardt We detect weak gravitational lensing of the cosmic microwave background at the location of the W I S E × SuperCOSMOS ( W I S E × SCOS ) galaxies using the publicly available Planck lensing convergence map. By stacking the lensing convergence map at the position of 12.4 million galaxies in the redshift range 0.1 ... [Phys. Rev. D 98, 043506] Published Mon Aug 06, 2018

Schlagwort(e): Cosmology

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Inflation in an effective gravitational model and asymptotic safety (2018)

Lei-Hua Liu, Tomislav Prokopec, and Alexei A. Starobinsky

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-07

Beschreibung: Author(s): Lei-Hua Liu, Tomislav Prokopec, and Alexei A. Starobinsky We consider an inflationary model motivated by quantum effects of gravitational and matter fields near the Planck scale. Our Lagrangian is a resummed version of the effective Lagrangian recently obtained by Demmel, Saueressig, and Zanusso [A proper fixed functional for four-dimensional quantum Einst... [Phys. Rev. D 98, 043505] Published Mon Aug 06, 2018

Schlagwort(e): Cosmology

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Testing the cosmic anisotropy with supernovae data: Hemisphere comparison and dipole fitting (2018)

Hua-Kai Deng and Hao Wei

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Hua-Kai Deng and Hao Wei The cosmological principle is one of the cornerstones in modern cosmology. It assumes that the universe is homogeneous and isotropic on cosmic scales. Both the homogeneity and the isotropy of the universe should be tested carefully. In the present work, we are interested in probing the possible pref... [Phys. Rev. D 97, 123515] Published Mon Jun 11, 2018

Schlagwort(e): Cosmology

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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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Practical Unitary Simulator for Non-Markovian Complex Processes (2018)

Felix C. Binder, Jayne Thompson, and Mile Gu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Felix C. Binder, Jayne Thompson, and Mile Gu Stochastic processes are as ubiquitous throughout the quantitative sciences as they are notorious for being difficult to simulate and predict. In this Letter, we propose a unitary quantum simulator for discrete-time stochastic processes which requires less internal memory than any classical analogue... [Phys. Rev. Lett. 120, 240502] Published Mon Jun 11, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Experimental Machine Learning of Quantum States (2018)

Jun Gao, Lu-Feng Qiao, Zhi-Qiang Jiao, Yue-Chi Ma, Cheng-Qiu Hu, Ruo-Jing Ren, Ai-Lin Yang, Hao Tang, Man-Hong Yung, and Xian-Min Jin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): Jun Gao, Lu-Feng Qiao, Zhi-Qiang Jiao, Yue-Chi Ma, Cheng-Qiu Hu, Ruo-Jing Ren, Ai-Lin Yang, Hao Tang, Man-Hong Yung, and Xian-Min Jin Quantum information technologies provide promising applications in communication and computation, while machine learning has become a powerful technique for extracting meaningful structures in “big data.” A crossover between quantum information and machine learning represents a new interdisciplinary... [Phys. Rev. Lett. 120, 240501] Published Mon Jun 11, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Model independent inference of the expansion history and implications for the growth of structure (2018)

Shahab Joudaki, Manoj Kaplinghat, Ryan Keeley, and David Kirkby

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-05

Beschreibung: Author(s): Shahab Joudaki, Manoj Kaplinghat, Ryan Keeley, and David Kirkby A “crisis in cosmology” is lurking in recent measurements of the Hubble constant H 0 (the current expansion rate of the Universe), caused by a tension between direct observations through distance measurements and an inferred value, computed with the standard model of cosmology ( Λ CDM) from CMB data. The latter involves an approx. 13 billion years time evolution. The authors use statistical methods to analyze different available data sets from different kind of observations that carry information about different moments from the evolution of the Universe, to determine H 0 in a model independent way, making only minimal basic assumptions, and find that the tension with direct observation of H 0 persists. [Phys. Rev. D 97, 123501] Published Mon Jun 04, 2018

Schlagwort(e): Cosmology

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Postinflationary scalar tensor cosmology and inflationary parameters (2018)

Anshuman Maharana and Ivonne Zavala

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-14

Beschreibung: Author(s): Anshuman Maharana and Ivonne Zavala Scalar fields provide attractive modifications of pre-BBN cosmology, which have interesting implications for dark matter abundances. We analyze the effect of these modifications on the number of e -foldings between the horizon exit of cosmic microwave background modes and the end of inflation ( N k ) , a... [Phys. Rev. D 97, 123518] Published Wed Jun 13, 2018

Schlagwort(e): Cosmology

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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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Latent Space Purification via Neural Density Operators (2018)

Giacomo Torlai and Roger G. Melko

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-16

Beschreibung: Author(s): Giacomo Torlai and Roger G. Melko Machine learning is actively being explored for its potential to design, validate, and even hybridize with near-term quantum devices. A central question is whether neural networks can provide a tractable representation of a given quantum state of interest. When true, stochastic neural networks can b... [Phys. Rev. Lett. 120, 240503] Published Fri Jun 15, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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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Confronting Kähler moduli inflation with CMB data (2018)

Sukannya Bhattacharya, Koushik Dutta, Mayukh Raj Gangopadhyay, and Anshuman Maharana

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-23

Beschreibung: Author(s): Sukannya Bhattacharya, Koushik Dutta, Mayukh Raj Gangopadhyay, and Anshuman Maharana In models of inflation obtained from string compactification, moduli vacuum misalignment leads to an epoch in the postinflationary history of the Universe when the energy density is dominated by cold moduli particles. This effect leads to a modification in the number of e -foldings ( N pivot ) between t... [Phys. Rev. D 97, 123533] Published Fri Jun 22, 2018

Schlagwort(e): Cosmology

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Phantom crossing dark energy in Horndeski’s theory (2018)

Jiro Matsumoto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-06-27

Beschreibung: Author(s): Jiro Matsumoto The Λ CDM model is a remarkably successful model which is consistent with the observations of cosmic microwave background radiation (CMB), baryon acoustic oscillation (BAO), and the large scale structure of the Universe. However, the discrepancy in the value of H 0 between the local observations and P... [Phys. Rev. D 97, 123538] Published Tue Jun 26, 2018

Schlagwort(e): Cosmology

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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Conformal Data and Renormalization Group Flow in Critical Quantum Spin Chains Using Periodic Uniform Matrix Product States (2018)

Yijian Zou, Ashley Milsted, and Guifre Vidal

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-08

Beschreibung: Author(s): Yijian Zou, Ashley Milsted, and Guifre Vidal We establish that a Bloch-state ansatz based on periodic uniform matrix product states (PUMPS), originally designed to capture single-quasiparticle excitations in gapped systems, is in fact capable of accurately approximating all low-energy eigenstates of critical quantum spin chains on the circle. ... [Phys. Rev. Lett. 121, 230402] Published Fri Dec 07, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Superdiffusion in One-Dimensional Quantum Lattice Models (2018)

Enej Ilievski, Jacopo De Nardis, Marko Medenjak, and Tomaž Prosen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-08

Beschreibung: Author(s): Enej Ilievski, Jacopo De Nardis, Marko Medenjak, and Tomaž Prosen We identify a class of one-dimensional spin and fermionic lattice models that display diverging spin and charge diffusion constants, including several paradigmatic models of exactly solvable, strongly correlated many-body dynamics such as the isotropic Heisenberg spin chains, the Fermi-Hubbard model... [Phys. Rev. Lett. 121, 230602] Published Fri Dec 07, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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Efficient Adiabatic Spin-Dependent Kicks in an Atom Interferometer (2018)

Matt Jaffe, Victoria Xu, Philipp Haslinger, Holger Müller, and Paul Hamilton

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Matt Jaffe, Victoria Xu, Philipp Haslinger, Holger Müller, and Paul Hamilton We present an atom interferometry technique in which the beam splitter is split into two separate operations. A microwave pulse first creates a spin-state superposition, before optical adiabatic passage spatially separates the arms of that superposition. Despite using a thermal atom sample in a smal... [Phys. Rev. Lett. 121, 040402] Published Tue Jul 24, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Single-Mode Phononic Wire (2018)

Rishi N. Patel, Zhaoyou Wang, Wentao Jiang, Christopher J. Sarabalis, Jeff T. Hill, and Amir H. Safavi-Naeini

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Rishi N. Patel, Zhaoyou Wang, Wentao Jiang, Christopher J. Sarabalis, Jeff T. Hill, and Amir H. Safavi-Naeini Photons and electrons transmit information to form complex systems and networks. Phonons on the other hand, the quanta of mechanical motion, are often considered only as carriers of thermal energy. Nonetheless, their flow can also be molded in fabricated nanoscale circuits. We design and experimenta... [Phys. Rev. Lett. 121, 040501] Published Tue Jul 24, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Response Functions as Quantifiers of Non-Markovianity (2018)

Philipp Strasberg and Massimiliano Esposito

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Philipp Strasberg and Massimiliano Esposito Quantum non-Markovianity is crucially related to the study of dynamical maps, which are usually derived for initially factorized system-bath states. We demonstrate that linear response theory also provides a way to derive dynamical maps but for initially correlated (and, in general, entangled) state... [Phys. Rev. Lett. 121, 040601] Published Tue Jul 24, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Fast and Unconditional All-Microwave Reset of a Superconducting Qubit (2018)

P. Magnard, P. Kurpiers, B. Royer, T. Walter, J.-C. Besse, S. Gasparinetti, M. Pechal, J. Heinsoo, S. Storz, A. Blais, and A. Wallraff

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): P. Magnard, P. Kurpiers, B. Royer, T. Walter, J.-C. Besse, S. Gasparinetti, M. Pechal, J. Heinsoo, S. Storz, A. Blais, and A. Wallraff Active qubit reset is a key operation in many quantum algorithms, and particularly in quantum error correction. Here, we experimentally demonstrate a reset scheme for a three-level transmon artificial atom coupled to a large bandwidth resonator. The reset protocol uses a microwave-induced interactio... [Phys. Rev. Lett. 121, 060502] Published Tue Aug 07, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Coulomb-Gas Electrostatics Controls Large Fluctuations of the Kardar-Parisi-Zhang Equation (2018)

Ivan Corwin, Promit Ghosal, Alexandre Krajenbrink, Pierre Le Doussal, and Li-Cheng Tsai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Ivan Corwin, Promit Ghosal, Alexandre Krajenbrink, Pierre Le Doussal, and Li-Cheng Tsai We establish a large deviation principle for the Kardar-Parisi-Zhang (KPZ) equation, providing precise control over the left tail of the height distribution for narrow wedge initial condition. Our analysis exploits an exact connection between the KPZ one-point distribution and the Airy point process... [Phys. Rev. Lett. 121, 060201] Published Wed Aug 08, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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Controllable Non-Markovianity for a Spin Qubit in Diamond (2018)

J. F. Haase, P. J. Vetter, T. Unden, A. Smirne, J. Rosskopf, B. Naydenov, A. Stacey, F. Jelezko, M. B. Plenio, and S. F. Huelga

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-11

Beschreibung: Author(s): J. F. Haase, P. J. Vetter, T. Unden, A. Smirne, J. Rosskopf, B. Naydenov, A. Stacey, F. Jelezko, M. B. Plenio, and S. F. Huelga We present a flexible scheme to realize non-Markovian dynamics of an electronic spin qubit, using a nitrogen-vacancy center in diamond where the inherent nitrogen spin serves as a regulator of the dynamics. By changing the population of the nitrogen spin, we show that we can smoothly tune the non-Ma... [Phys. Rev. Lett. 121, 060401] Published Thu Aug 09, 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

Schlagwort(e): Quantum information

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Extended family of generalized Chaplygin gas models (2018)

V. M. C. Ferreira and P. P. Avelino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): V. M. C. Ferreira and P. P. Avelino The generalized Chaplygin gas is usually defined as a barotropic perfect fluid with an equation of state p = − A ρ − α , where ρ and p are the proper energy density and pressure, respectively, and A and α are positive real parameters. It has been extensively studied in the literature as a quartessence prot... [Phys. Rev. D 98, 043515] Published Tue Aug 14, 2018

Schlagwort(e): Cosmology

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Cogenesis of LIGO primordial black holes and dark matter (2018)

Fuminori Hasegawa and Masahiro Kawasaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): Fuminori Hasegawa and Masahiro Kawasaki By connecting p r i m o r d i a l b a c k h o l e s ( P B H s ) , b a r y o n a s y m m e t r y and s o l i t o n s ( Q − b a l l s ) in a novel way, the authors propose a scenario that simultaneously explains the massive (~ 30 solar masses) black holes observed by LIGO and the observed dark matter abundance. The generic mechanism involved is conceivable and most importantly, by seeding the PBHs by baryon number perturbations one avoids stringent cosmological/CMB constraints for PBH masses; dark matter is mostly given by Q-balls. [Phys. Rev. D 98, 043514] Published Tue Aug 14, 2018

Schlagwort(e): Cosmology

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Nonperturbative $δN$ formalism (2018)

Shailee V. Imrith, David J. Mulryne, and Arttu Rajantie

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-15

Beschreibung: Author(s): Shailee V. Imrith, David J. Mulryne, and Arttu Rajantie We revisit the question of how to calculate correlations of the curvature perturbation, ζ , using the δ N formalism when one cannot employ a truncated Taylor expansion of N . This problem arises when one uses lattice simulations to probe the effects of isocurvature modes on models of reheating. Working... [Phys. Rev. D 98, 043513] Published Tue Aug 14, 2018

Schlagwort(e): Cosmology

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Anisotropic inflation in Brans-Dicke gravity with a non-Abelian gauge field (2018)

M. Tirandari, Kh. Saaidi, and A. Mohammadi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): M. Tirandari, Kh. Saaidi, and A. Mohammadi We study anisotropic inflation in the Brans-Dicke gravity in the presence of a non-Abelian gauge field where the gauge field is nonminimally coupled to the inflaton. We consider the displaced quadratic potential for the inflation. We find out that the solution of equations of motion is an attractor ... [Phys. Rev. D 98, 043516] Published Wed Aug 15, 2018

Schlagwort(e): Cosmology

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Large-scale (in) stability analysis of an exactly solved coupled dark-energy model (2018)

Weiqiang Yang, Supriya Pan, Ramón Herrera, and Subenoy Chakraborty

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): Weiqiang Yang, Supriya Pan, Ramón Herrera, and Subenoy Chakraborty Assuming a nongravitational interaction among the dark fluids of our Universe—namely, dark matter and dark energy—we study a specific interaction model in the background of a spatially flat Friedmann-Lemaître-Robertson-Walker geometry. We find that the interaction model solves the background evoluti... [Phys. Rev. D 98, 043517] Published Wed Aug 15, 2018

Schlagwort(e): Cosmology

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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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Quantum Walk in Momentum Space with a Bose-Einstein Condensate (2018)

Siamak Dadras, Alexander Gresch, Caspar Groiseau, Sandro Wimberger, and Gil S. Summy

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-17

Beschreibung: Author(s): Siamak Dadras, Alexander Gresch, Caspar Groiseau, Sandro Wimberger, and Gil S. Summy By manipulating the momenta of ultracold atoms, researchers demonstrate a quantum walk—a potential ingredient for quantum search algorithms. [Phys. Rev. Lett. 121, 070402] Published Thu Aug 16, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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Cosmic Bell Test Using Random Measurement Settings from High-Redshift Quasars (2018)

Dominik Rauch, Johannes Handsteiner, Armin Hochrainer, Jason Gallicchio, Andrew S. Friedman, Calvin Leung, Bo Liu, Lukas Bulla, Sebastian Ecker, Fabian Steinlechner, Rupert Ursin, Beili Hu, David Leon, Chris Benn, Adriano Ghedina, Massimo Cecconi, Alan H. Guth, David I. Kaiser, Thomas Scheidl, and Anton Zeilinger

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Dominik Rauch, Johannes Handsteiner, Armin Hochrainer, Jason Gallicchio, Andrew S. Friedman, Calvin Leung, Bo Liu, Lukas Bulla, Sebastian Ecker, Fabian Steinlechner, Rupert Ursin, Beili Hu, David Leon, Chris Benn, Adriano Ghedina, Massimo Cecconi, Alan H. Guth, David I. Kaiser, Thomas Scheidl, and Anton Zeilinger Two groups have ruled out local realism on cosmic scales, one using stars and also closing the detection loophole, the other using distant quasars. [Phys. Rev. Lett. 121, 080403] Published Mon Aug 20, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Ultimate frontier of 21-cm cosmology (2018)

Patrick C. Breysse, Yacine Ali-Haïmoud, and Christopher M. Hirata

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Patrick C. Breysse, Yacine Ali-Haïmoud, and Christopher M. Hirata We present the most detailed computation to date of the 21-cm global signal and fluctuations at z ≳ 500 . Our calculations include a highly precise estimate of the Wouthuysen-Field effect and the first explicit calculation of the impact of free-free processes, the two dominant components of the signal ... [Phys. Rev. D 98, 043520] Published Mon Aug 20, 2018

Schlagwort(e): Cosmology

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Test of Local Realism into the Past without Detection and Locality Loopholes (2018)

Ming-Han Li, Cheng Wu, Yanbao Zhang, Wen-Zhao Liu, Bing Bai, Yang Liu, Weijun Zhang, Qi Zhao, Hao Li, Zhen Wang, Lixing You, W. J. Munro, Juan Yin, Jun Zhang, Cheng-Zhi Peng, Xiongfeng Ma, Qiang Zhang, Jingyun Fan, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Ming-Han Li, Cheng Wu, Yanbao Zhang, Wen-Zhao Liu, Bing Bai, Yang Liu, Weijun Zhang, Qi Zhao, Hao Li, Zhen Wang, Lixing You, W. J. Munro, Juan Yin, Jun Zhang, Cheng-Zhi Peng, Xiongfeng Ma, Qiang Zhang, Jingyun Fan, and Jian-Wei Pan Two groups have ruled out local realism on cosmic scales, one using stars and also closing the detection loophole, the other using distant quasars. [Phys. Rev. Lett. 121, 080404] Published Mon Aug 20, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Constraints on a Spin-Dependent Exotic Interaction between Electrons with Single Electron Spin Quantum Sensors (2018)

Xing Rong, Man Jiao, Jianpei Geng, Bo Zhang, Tianyu Xie, Fazhan Shi, Chang-Kui Duan, Yi-Fu Cai, and Jiangfeng Du

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-23

Beschreibung: Author(s): Xing Rong, Man Jiao, Jianpei Geng, Bo Zhang, Tianyu Xie, Fazhan Shi, Chang-Kui Duan, Yi-Fu Cai, and Jiangfeng Du A new laboratory bound on the axial-vector mediated interaction between electron spins at micrometer scale is established with single nitrogen-vacancy (NV) centers in diamond. A single crystal of p -terphenyl doped pentacene- d 14 under laser pumping provides the source of polarized electron spins. Bas... [Phys. Rev. Lett. 121, 080402] Published Wed Aug 22, 2018

Schlagwort(e): General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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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

Schlagwort(e): Quantum information

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Unsqueezing of standing waves due to inflationary domain structure (2018)

Carlo R. Contaldi and João Magueijo

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Carlo R. Contaldi and João Magueijo The so-called trans-Planckian problem of inflation may be evaded by positing that modes come into existence only when they became “cis-Planckian” by virtue of expansion. However, this would imply that for any mode a new random realization would have to be drawn every N wavelengths, with N typically ... [Phys. Rev. D 98, 043523] Published Tue Aug 21, 2018

Schlagwort(e): Cosmology

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Preinflationary dynamics of an $α−$attractor in loop quantum cosmology (2018)

M. Shahalam, M. Sami, and Anzhong Wang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): M. Shahalam, M. Sami, and Anzhong Wang We systematically study the preinflationary dynamics of the spatially flat Friedmann-Lemaitre-Robertson-Walker universe filled with a single scalar field that has the generalized α -attractor potentials, in the framework of loop quantum cosmology, in which the big bang singularity is replaced generic... [Phys. Rev. D 98, 043524] Published Tue Aug 21, 2018

Schlagwort(e): Cosmology

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CMB lensing bispectrum as a probe of modified gravity theories (2018)

Toshiya Namikawa, François R. Bouchet, and Atsushi Taruya

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-29

Beschreibung: Author(s): Toshiya Namikawa, François R. Bouchet, and Atsushi Taruya Cosmological structures grow differently in theories of gravity which are modified as compared to Einstein’s general relativity (GR). Cosmic microwave background (CMB) fluctuation patterns at the last scattering surface are lensed by these structures along the photon path to the observer. The observ... [Phys. Rev. D 98, 043530] Published Tue Aug 28, 2018

Schlagwort(e): Cosmology

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Dark Energy Survey year 1 results: Cosmological constraints from galaxy clustering and weak lensing (2018)

T. M. C. Abbott et al. (Dark Energy Survey Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): T. M. C. Abbott et al. (Dark Energy Survey Collaboration) Analyzing its first year of data, the Dark Energy Survey has demonstrated that weak lensing can probe cosmological parameters with a precision comparable to cosmic microwave background observations. [Phys. Rev. D 98, 043526] Published Mon Aug 27, 2018

Schlagwort(e): Cosmology

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Dark Energy Survey Year 1 results: Cosmological constraints from cosmic shear (2018)

M. A. Troxel et al. (DES Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): M. A. Troxel et al. (DES Collaboration) Analyzing its first year of data, the Dark Energy Survey has demonstrated that weak lensing can probe cosmological parameters with a precision comparable to cosmic microwave background observations. [Phys. Rev. D 98, 043528] Published Mon Aug 27, 2018

Schlagwort(e): Cosmology

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Gravitational redshift in the void-galaxy cross-correlation function in redshift space (2018)

Yue Nan and Kazuhiro Yamamoto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): Yue Nan and Kazuhiro Yamamoto We construct an analytic model for the void-galaxy cross-correlation function that enables theoretical predictions of the dipole signal produced dominantly by the gravitational redshift within voids for the first time. By extending a theoretical formulation for the redshift-space distortion of galax... [Phys. Rev. D 98, 043527] Published Mon Aug 27, 2018

Schlagwort(e): Cosmology

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Oscillons from pure natural inflation (2018)

Jeong-Pyong Hong, Masahiro Kawasaki, and Masahito Yamazaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): Jeong-Pyong Hong, Masahiro Kawasaki, and Masahito Yamazaki We examine the oscillon formation in a recently proposed inflation model of the pure natural inflation , where the inflaton is an axion that couples to a strongly coupled pure Yang-Mills theory. The plateau of the inflaton potential, which is favored by recent observations, drives the fragmentation o... [Phys. Rev. D 98, 043531] Published Mon Aug 27, 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

Schlagwort(e): Quantum information

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Model-independent predictions for smooth cosmic acceleration scenarios (2018)

V. Miranda and Cora Dvorkin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2018-08-31

Beschreibung: Author(s): V. Miranda and Cora Dvorkin Through likelihood analyses of both current and future data that constrain both the expansion history of the Universe and the clustering of matter fluctuations, we provide falsifiable predictions for three broad classes of models that explain the accelerated expansions of the Universe: Λ CDM , the qui... [Phys. Rev. D 98, 043537] Published Thu Aug 30, 2018

Schlagwort(e): Cosmology

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

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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

Schlagwort(e): Quantum information

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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