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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

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Digitale ISSN: 1079-7114

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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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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

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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

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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

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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

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Electron-Phonon Systems on a Universal Quantum Computer (2018)

Alexandru Macridin, Panagiotis Spentzouris, James Amundson, and Roni Harnik

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-13

Beschreibung: Author(s): Alexandru Macridin, Panagiotis Spentzouris, James Amundson, and Roni Harnik We present an algorithm that extends existing quantum algorithms for simulating fermion systems in quantum chemistry and condensed matter physics to include bosons in general and phonons in particular. We introduce a qubit representation for the low-energy subspace of phonons which allows an efficie... [Phys. Rev. Lett. 121, 110504] Published Wed Sep 12, 2018

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Spatially Adiabatic Frequency Conversion in Optoelectromechanical Arrays (2018)

Ondřej Černotík, Sahand Mahmoodian, and Klemens Hammerer

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-15

Beschreibung: Author(s): Ondřej Černotík, Sahand Mahmoodian, and Klemens Hammerer Faithful conversion of quantum signals between microwave and optical frequency domains is crucial for building quantum networks based on superconducting circuits. Optoelectromechanical systems, in which microwave and optical cavity modes are coupled to a common mechanical oscillator, are a promising... [Phys. Rev. Lett. 121, 110506] Published Fri Sep 14, 2018

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Cycling Tames Power Fluctuations near Optimum Efficiency (2018)

Viktor Holubec and Artem Ryabov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): Viktor Holubec and Artem Ryabov According to the laws of thermodynamics, no heat engine can beat the efficiency of a Carnot cycle. This efficiency traditionally comes with vanishing power output and practical designs, optimized for power, generally achieve far less. Recently, various strategies to obtain Carnot’s efficiency at lar... [Phys. Rev. Lett. 121, 120601] Published Mon Sep 17, 2018

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Anomalous Breaking of Scale Invariance in a Two-Dimensional Fermi Gas (2018)

M. Holten, L. Bayha, A. C. Klein, P. A. Murthy, P. M. Preiss, and S. Jochim

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): M. Holten, L. Bayha, A. C. Klein, P. A. Murthy, P. M. Preiss, and S. Jochim The frequency of the breathing mode of a two-dimensional Fermi gas with zero-range interactions in a harmonic confinement is fixed by the scale invariance of the Hamiltonian. Scale invariance is broken in the quantized theory by introducing the two-dimensional scattering length as a regulator. This ... [Phys. Rev. Lett. 121, 120401] Published Mon Sep 17, 2018

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Discontinuous Phase Transitions in Nonlocal Schloegl Models for Autocatalysis: Loss and Reemergence of a Nonequilibrium Gibbs Phase Rule (2018)

Da-Jiang Liu, Chi-Jen Wang, and James W. Evans

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-22

Beschreibung: Author(s): Da-Jiang Liu, Chi-Jen Wang, and James W. Evans We consider Schloegl models (or contact processes) where particles on a square grid annihilate at a rate p and are created at a rate of k n = n ( n − 1 ) / [ N ( N − 1 ) ] at empty sites with n particles in a neighborhood Ω N of size N . Simulation reveals a discontinuous transition between populated and vacuum states... [Phys. Rev. Lett. 121, 120603] Published Fri Sep 21, 2018

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Unified Thermodynamic Uncertainty Relations in Linear Response (2018)

Katarzyna Macieszczak, Kay Brandner, and Juan P. Garrahan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-25

Beschreibung: Author(s): Katarzyna Macieszczak, Kay Brandner, and Juan P. Garrahan Thermodynamic uncertainty relations (TURs) are recently established relations between the relative uncertainty of time-integrated currents and entropy production in nonequilibrium systems. For small perturbations away from equilibrium, linear response (LR) theory provides the natural framework to st... [Phys. Rev. Lett. 121, 130601] Published Mon Sep 24, 2018

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Inhomogeneity-Induced Casimir Transport of Nanoparticles (2018)

Fanglin Bao, Kezhang Shi, Guanjun Cao, Julian S. Evans, and Sailing He

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-25

Beschreibung: Author(s): Fanglin Bao, Kezhang Shi, Guanjun Cao, Julian S. Evans, and Sailing He We propose a scheme for transporting nanoparticles immersed in a fluid, relying on quantum vacuum fluctuations. The mechanism lies in the inhomogeneity-induced lateral Casimir force between a nanoparticle and a gradient metasurface and the relaxation of the conventional Dzyaloshinskiǐ-Lifshitz-Pitae... [Phys. Rev. Lett. 121, 130401] Published Mon Sep 24, 2018

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Quantum Symmetry from Enhanced Sampling Methods (2018)

J. Runeson, M. Nava, and M. Parrinello

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-04

Beschreibung: Author(s): J. Runeson, M. Nava, and M. Parrinello We address the problem of the minus sign sampling for two-electron systems using the path integral approach. We show that this problem can be reexpressed as one of computing free energy differences and sampling the tails of statistical distributions. Using metadynamics, a realistic problem like that... [Phys. Rev. Lett. 121, 140602] Published Wed Oct 03, 2018

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Concentration-of-Measure Theory for Structures and Fluctuations of Waves (2018)

Ping Fang, Liyi Zhao, and Chushun Tian

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-04

Beschreibung: Author(s): Ping Fang, Liyi Zhao, and Chushun Tian The emergence of nonequilibrium phenomena in individual complex wave systems has long been of fundamental interest. Its analytic studies remain notoriously difficult. Using the mathematical tool of the concentration of measure , we develop a theory for structures and fluctuations of waves in individu... [Phys. Rev. Lett. 121, 140603] Published Wed Oct 03, 2018

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Rényi Generalization of the Accessible Entanglement Entropy (2018)

Hatem Barghathi, C. M. Herdman, and Adrian Del Maestro

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-13

Beschreibung: Author(s): Hatem Barghathi, C. M. Herdman, and Adrian Del Maestro Operationally accessible entanglement in bipartite systems of indistinguishable particles could be reduced due to restrictions on the allowed local operations as a result of particle number conservation. In order to quantify this effect, Wiseman and Vaccaro [ Phys. Rev. Lett. 91 , 097902 (2003) ] intro... [Phys. Rev. Lett. 121, 150501] Published Fri Oct 12, 2018

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Exact Persistence Exponent for the $2D$-Diffusion Equation and Related Kac Polynomials (2018)

Mihail Poplavskyi and Grégory Schehr

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-13

Beschreibung: Author(s): Mihail Poplavskyi and Grégory Schehr We compute the persistence for the 2 D -diffusion equation with random initial condition, i.e., the probability p 0 ( t ) that the diffusion field, at a given point x in the plane, has not changed sign up to time t . For large t , we show that p 0 ( t ) ∼ t − θ ( 2 ) with θ ( 2 ) = 3 / 16 . Using the connection between the 2 D ... [Phys. Rev. Lett. 121, 150601] Published Fri Oct 12, 2018

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Quantum Secret Sharing Among Four Players Using Multipartite Bound Entanglement of an Optical Field (2018)

Yaoyao Zhou, Juan Yu, Zhihui Yan, Xiaojun Jia, Jing Zhang, Changde Xie, and Kunchi Peng

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-13

Beschreibung: Author(s): Yaoyao Zhou, Juan Yu, Zhihui Yan, Xiaojun Jia, Jing Zhang, Changde Xie, and Kunchi Peng Secret sharing is a conventional technique for realizing secure communications in information networks, where a dealer distributes to n players a secret, which can only be decoded through the cooperation of k ( n / 2 〈 k ≤ n ) players. In recent years, quantum resources have been employed to enhance secu... [Phys. Rev. Lett. 121, 150502] Published Fri Oct 12, 2018

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High-Dimensional Quantum Communication Complexity beyond Strategies Based on Bell’s Theorem (2018)

Daniel Martínez, Armin Tavakoli, Mauricio Casanova, Gustavo Cañas, Breno Marques, and Gustavo Lima

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-13

Beschreibung: Author(s): Daniel Martínez, Armin Tavakoli, Mauricio Casanova, Gustavo Cañas, Breno Marques, and Gustavo Lima Quantum resources can improve communication complexity problems (CCPs) beyond their classical constraints. One quantum approach is to share entanglement and create correlations violating a Bell inequality, which can then assist classical communication. A second approach is to resort solely to the pr... [Phys. Rev. Lett. 121, 150504] Published Fri Oct 12, 2018

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Uncover Topology by Quantum Quench Dynamics (2018)

Wei Sun, Chang-Rui Yi, Bao-Zong Wang, Wei-Wei Zhang, Barry C. Sanders, Xiao-Tian Xu, Zong-Yao Wang, Joerg Schmiedmayer, Youjin Deng, Xiong-Jun Liu, Shuai Chen, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Wei Sun, Chang-Rui Yi, Bao-Zong Wang, Wei-Wei Zhang, Barry C. Sanders, Xiao-Tian Xu, Zong-Yao Wang, Joerg Schmiedmayer, Youjin Deng, Xiong-Jun Liu, Shuai Chen, and Jian-Wei Pan Topological quantum states are characterized by nonlocal invariants. We present a new dynamical approach for ultracold-atom systems to uncover their band topology, and we provide solid evidence to demonstrate its experimental advantages. After quenching a two-dimensional (2D) Chern band, realized in... [Phys. Rev. Lett. 121, 250403] Published Tue Dec 18, 2018

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Computational Speedups Using Small Quantum Devices (2018)

Vedran Dunjko, Yimin Ge, and J. Ignacio Cirac

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Vedran Dunjko, Yimin Ge, and J. Ignacio Cirac A hybrid quantum-classical computing algorithm could solve a basic computer science problem faster than a classical computer. [Phys. Rev. Lett. 121, 250501] Published Tue Dec 18, 2018

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Temperature Dependence of the Butterfly Effect in a Classical Many-Body System (2018)

Thomas Bilitewski, Subhro Bhattacharjee, and Roderich Moessner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Thomas Bilitewski, Subhro Bhattacharjee, and Roderich Moessner We study the chaotic dynamics in a classical many-body system of interacting spins on the kagome lattice. We characterize many-body chaos via the butterfly effect as captured by an appropriate out-of-time-ordered commutator. Due to the emergence of a spin-liquid phase, the chaotic dynamics extends a... [Phys. Rev. Lett. 121, 250602] Published Tue Dec 18, 2018

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Multiphoton Tomography with Linear Optics and Photon Counting (2018)

Leonardo Banchi, W. Steven Kolthammer, and M. S. Kim

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Leonardo Banchi, W. Steven Kolthammer, and M. S. Kim Determining an unknown quantum state from an ensemble of identical systems is a fundamental, yet experimentally demanding, task in quantum science. Here we study the number of measurement bases needed to fully characterize an arbitrary multimode state containing a definite number of photons, or an a... [Phys. Rev. Lett. 121, 250402] Published Tue Dec 18, 2018

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Beating the Rayleigh Limit Using Two-Photon Interference (2018)

Michał Parniak, Sebastian Borówka, Kajetan Boroszko, Wojciech Wasilewski, Konrad Banaszek, and Rafał Demkowicz-Dobrzański

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Michał Parniak, Sebastian Borówka, Kajetan Boroszko, Wojciech Wasilewski, Konrad Banaszek, and Rafał Demkowicz-Dobrzański Multiparameter estimation theory offers a general framework to explore imaging techniques beyond the Rayleigh limit. While optimal measurements of single parameters characterizing a composite light source are now well understood, simultaneous determination of multiple parameters poses a much greater... [Phys. Rev. Lett. 121, 250503] Published Tue Dec 18, 2018

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Stabilizer Slicing: Coherent Error Cancellations in Low-Density Parity-Check Stabilizer Codes (2018)

Dripto M. Debroy, Muyuan Li, Michael Newman, and Kenneth R. Brown

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): Dripto M. Debroy, Muyuan Li, Michael Newman, and Kenneth R. Brown Coherent errors are a dominant noise process in many quantum computing architectures. Unlike stochastic errors, these errors can combine constructively and grow into highly detrimental overrotations. To combat this, we introduce a simple technique for suppressing systematic coherent errors in low-de... [Phys. Rev. Lett. 121, 250502] Published Tue Dec 18, 2018

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Rotating Atomic Quantum Gases with Light-Induced Azimuthal Gauge Potentials and the Observation of the Hess-Fairbank Effect (2018)

P.-K. Chen, L.-R. Liu, M.-J. Tsai, N.-C. Chiu, Y. Kawaguchi, S.-K. Yip, M.-S. Chang, and Y.-J. Lin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): P.-K. Chen, L.-R. Liu, M.-J. Tsai, N.-C. Chiu, Y. Kawaguchi, S.-K. Yip, M.-S. Chang, and Y.-J. Lin We demonstrate synthetic azimuthal gauge potentials for Bose-Einstein condensates from engineering atom-light couplings. The gauge potential is created by adiabatically loading the condensate into the lowest energy Raman-dressed state, achieving a coreless vortex state. The azimuthal gauge potential... [Phys. Rev. Lett. 121, 250401] Published Tue Dec 18, 2018

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Fundamental Limits on the Capacities of Bipartite Quantum Interactions (2018)

Stefan Bäuml, Siddhartha Das, and Mark M. Wilde

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-20

Beschreibung: Author(s): Stefan Bäuml, Siddhartha Das, and Mark M. Wilde Bipartite quantum interactions have applications in a number of different areas of quantum physics, reaching from fundamental areas such as quantum thermodynamics and the theory of quantum measurements to other applications such as quantum computers, quantum key distribution, and other information p... [Phys. Rev. Lett. 121, 250504] Published Wed Dec 19, 2018

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Topological Entanglement-Spectrum Crossing in Quench Dynamics (2018)

Zongping Gong and Masahito Ueda

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-20

Beschreibung: Author(s): Zongping Gong and Masahito Ueda We unveil the stable ( d + 1 )-dimensional topological structures underlying the quench dynamics for all of the Altland-Zirnbauer classes in d = 1 dimension, and we propose to detect such dynamical topology from the time evolution of entanglement spectra. Focusing on systems in classes BDI and D, we find ... [Phys. Rev. Lett. 121, 250601] Published Wed Dec 19, 2018

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Asymmetric Particle Transport and Light-Cone Dynamics Induced by Anyonic Statistics (2018)

Fangli Liu, James R. Garrison, Dong-Ling Deng, Zhe-Xuan Gong, and Alexey V. Gorshkov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-21

Beschreibung: Author(s): Fangli Liu, James R. Garrison, Dong-Ling Deng, Zhe-Xuan Gong, and Alexey V. Gorshkov In the study of non-equilibrium dynamics of Abelian anyons, spatially asymmetric particle transport is found, providing a novel method to detect anyonic statistics. [Phys. Rev. Lett. 121, 250404] Published Thu Dec 20, 2018

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Generic Emergence of Objectivity of Observables in Infinite Dimensions (2018)

Paul A. Knott, Tommaso Tufarelli, Marco Piani, and Gerardo Adesso

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-18

Beschreibung: Author(s): Paul A. Knott, Tommaso Tufarelli, Marco Piani, and Gerardo Adesso Quantum Darwinism posits that information becomes objective whenever multiple observers indirectly probe a quantum system by each measuring a fraction of the environment. It was recently shown that objectivity of observables emerges generically from the mathematical structure of quantum mechanics, w... [Phys. Rev. Lett. 121, 160401] Published Wed Oct 17, 2018

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Geometrical Bounds on Irreversibility in Open Quantum Systems (2018)

Luca Mancino, Vasco Cavina, Antonella De Pasquale, Marco Sbroscia, Robert I. Booth, Emanuele Roccia, Ilaria Gianani, Vittorio Giovannetti, and Marco Barbieri

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-18

Beschreibung: Author(s): Luca Mancino, Vasco Cavina, Antonella De Pasquale, Marco Sbroscia, Robert I. Booth, Emanuele Roccia, Ilaria Gianani, Vittorio Giovannetti, and Marco Barbieri Theoretical bounds on irreversible entropy production in a thermalizing quantum system are supported by experiments simulating the thermalization of a qubit using a quantum photonic architecture. [Phys. Rev. Lett. 121, 160602] Published Wed Oct 17, 2018

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Locality Bound for Dissipative Quantum Transport (2018)

Xizhi Han (韩希之) and Sean A. Hartnoll

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-24

Beschreibung: Author(s): Xizhi Han (韩希之) and Sean A. Hartnoll We prove an upper bound on the diffusivity of a dissipative, local, and translation invariant quantum Markovian spin system: D ≤ D 0 + ( α v LR τ + β ξ ) v C . Here v LR is the Lieb-Robinson velocity, v C is a velocity defined by the current operator, τ is the decoherence time, ξ is the range of interactions, D 0 is a... [Phys. Rev. Lett. 121, 170601] Published Tue Oct 23, 2018

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Recovering Quantum Gates from Few Average Gate Fidelities (2018)

I. Roth, R. Kueng, S. Kimmel, Y.-K. Liu, D. Gross, J. Eisert, and M. Kliesch

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-25

Beschreibung: Author(s): I. Roth, R. Kueng, S. Kimmel, Y.-K. Liu, D. Gross, J. Eisert, and M. Kliesch A resource efficient quantum process tomography scheme which is robust against errors is realized by combining features from randomized benchmarking and compressed sensing. [Phys. Rev. Lett. 121, 170502] Published Wed Oct 24, 2018

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Secure Quantum Key Distribution over 421 km of Optical Fiber (2018)

Alberto Boaron, Gianluca Boso, Davide Rusca, Cédric Vulliez, Claire Autebert, Misael Caloz, Matthieu Perrenoud, Gaëtan Gras, Félix Bussières, Ming-Jun Li, Daniel Nolan, Anthony Martin, and Hugo Zbinden

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-06

Beschreibung: Author(s): Alberto Boaron, Gianluca Boso, Davide Rusca, Cédric Vulliez, Claire Autebert, Misael Caloz, Matthieu Perrenoud, Gaëtan Gras, Félix Bussières, Ming-Jun Li, Daniel Nolan, Anthony Martin, and Hugo Zbinden An optical-fiber-based quantum cryptography scheme works over a record distance of 421 km and at much faster rates than previous long-distance demonstrations. [Phys. Rev. Lett. 121, 190502] Published Mon Nov 05, 2018

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Quantifying Resources in General Resource Theory with Catalysts (2018)

Anurag Anshu, Min-Hsiu Hsieh, and Rahul Jain

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-10

Beschreibung: Author(s): Anurag Anshu, Min-Hsiu Hsieh, and Rahul Jain A question that is commonly asked in all areas of physics is how a certain property of a physical system can be used to achieve useful tasks and how to quantify the amount of such a property in a meaningful way. We answer this question by showing that, in a general resource-theoretic framework that ... [Phys. Rev. Lett. 121, 190504] Published Fri Nov 09, 2018

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Entanglement Hamiltonian of Interacting Fermionic Models (2018)

Francesco Parisen Toldin and Fakher F. Assaad

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-15

Beschreibung: Author(s): Francesco Parisen Toldin and Fakher F. Assaad Recent numerical advances in the field of strongly correlated electron systems allow the calculation of the entanglement spectrum and entropies for interacting fermionic systems. An explicit determination of the entanglement (modular) Hamiltonian has proven to be a considerably more difficult proble... [Phys. Rev. Lett. 121, 200602] Published Wed Nov 14, 2018

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Polarization Entanglement by Time-Reversed Hong-Ou-Mandel Interference (2018)

Yuanyuan Chen, Sebastian Ecker, Sören Wengerowsky, Lukas Bulla, Siddarth Koduru Joshi, Fabian Steinlechner, and Rupert Ursin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-15

Beschreibung: Author(s): Yuanyuan Chen, Sebastian Ecker, Sören Wengerowsky, Lukas Bulla, Siddarth Koduru Joshi, Fabian Steinlechner, and Rupert Ursin Sources of entanglement are an enabling resource in quantum technology, and pushing the limits of generation rate and quality of entanglement is a necessary prerequisite towards practical applications. Here, we present an ultrabright source of polarization-entangled photon pairs based on time-revers... [Phys. Rev. Lett. 121, 200502] Published Wed Nov 14, 2018

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High-Dimensional Entanglement in States with Positive Partial Transposition (2018)

Marcus Huber, Ludovico Lami, Cécilia Lancien, and Alexander Müller-Hermes

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-16

Beschreibung: Author(s): Marcus Huber, Ludovico Lami, Cécilia Lancien, and Alexander Müller-Hermes Genuine high-dimensional entanglement, i.e., the property of having a high Schmidt number, constitutes an instrumental resource in quantum communication, overcoming limitations of low-dimensional systems. States with a positive partial transpose (PPT) are generally considered weakly entangled, as th... [Phys. Rev. Lett. 121, 200503] Published Thu Nov 15, 2018

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Observation of Floquet Raman Transition in a Driven Solid-State Spin System (2018)

Zijun Shu, Yu Liu, Qingyun Cao, Pengcheng Yang, Shaoliang Zhang, Martin B. Plenio, Fedor Jelezko, and Jianming Cai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-20

Beschreibung: Author(s): Zijun Shu, Yu Liu, Qingyun Cao, Pengcheng Yang, Shaoliang Zhang, Martin B. Plenio, Fedor Jelezko, and Jianming Cai We experimentally observe Floquet Raman transitions in the weakly driven solid-state spin system of a nitrogen-vacancy center in diamond. The periodically driven spin system simulates a two-band Wannier-Stark ladder model and allows us to observe coherent spin state transfer arising from a Raman tra... [Phys. Rev. Lett. 121, 210501] Published Mon Nov 19, 2018

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Chaos Signatures in the Short and Long Time Behavior of the Out-of-Time Ordered Correlator (2018)

Ignacio García-Mata, Marcos Saraceno, Rodolfo A. Jalabert, Augusto J. Roncaglia, and Diego A. Wisniacki

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-21

Beschreibung: Author(s): Ignacio García-Mata, Marcos Saraceno, Rodolfo A. Jalabert, Augusto J. Roncaglia, and Diego A. Wisniacki Two properties are needed for a classical system to be chaotic: exponential stretching and mixing. Recently, out-of-time order correlators were proposed as a measure of chaos in a wide range of physical systems. While most of the attention has previously been devoted to the short time stretching asp... [Phys. Rev. Lett. 121, 210601] Published Tue Nov 20, 2018

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Detailed Fluctuation Relation for Arbitrary Measurement and Feedback Schemes (2018)

Patrick P. Potts and Peter Samuelsson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-22

Beschreibung: Author(s): Patrick P. Potts and Peter Samuelsson Fluctuation relations are powerful equalities that hold far from equilibrium. However, the standard approach to include measurement and feedback schemes may become inapplicable in certain situations, including continuous measurements, precise measurements of continuous variables, and feedback induce... [Phys. Rev. Lett. 121, 210603] Published Wed Nov 21, 2018

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Entropy Inflection and Invisible Low-Energy States: Defensive Alliance Example (2018)

Yi-Zhi Xu, Chi Ho Yeung, Hai-Jun Zhou, and David Saad

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-22

Beschreibung: Author(s): Yi-Zhi Xu, Chi Ho Yeung, Hai-Jun Zhou, and David Saad Lower temperature leads to a higher probability of visiting low-energy states. This intuitive belief underlies most physics-inspired strategies for addressing hard optimization problems. For instance, the popular simulated annealing (SA) dynamics is expected to approach a ground state if the tempera... [Phys. Rev. Lett. 121, 210602] Published Wed Nov 21, 2018

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Tailoring Non-Gaussian Continuous-Variable Graph States (2018)

Mattia Walschaers, Supratik Sarkar, Valentina Parigi, and Nicolas Treps

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-29

Beschreibung: Author(s): Mattia Walschaers, Supratik Sarkar, Valentina Parigi, and Nicolas Treps Graph states are the backbone of measurement-based continuous-variable quantum computation. However, experimental realizations of these states induce Gaussian measurement statistics for the field quadratures, which poses a barrier to obtain a genuine quantum advantage. In this Letter, we propose mod... [Phys. Rev. Lett. 121, 220501] Published Wed Nov 28, 2018

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Experimentally Robust Self-testing for Bipartite and Tripartite Entangled States (2018)

Wen-Hao Zhang, Geng Chen, Xing-Xiang Peng, Xiang-Jun Ye, Peng Yin, Ya Xiao, Zhi-Bo Hou, Ze-Di Cheng, Yu-Chun Wu, Jin-Shi Xu, Chuan-Feng Li, and Guang-Can Guo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-14

Beschreibung: Author(s): Wen-Hao Zhang, Geng Chen, Xing-Xiang Peng, Xiang-Jun Ye, Peng Yin, Ya Xiao, Zhi-Bo Hou, Ze-Di Cheng, Yu-Chun Wu, Jin-Shi Xu, Chuan-Feng Li, and Guang-Can Guo Self-testing is a method with which a classical user can certify the state and measurements of quantum systems in a device-independent way. In particular, self-testing of entangled states is of great importance in quantum information processing. An understandable example is that the maximal violatio... [Phys. Rev. Lett. 121, 240402] Published Thu Dec 13, 2018

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Defining the Work Done on an Electromagnetic Field (2018)

A. E. Allahverdyan and D. Karakhanyan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): A. E. Allahverdyan and D. Karakhanyan The problem of defining work done on an electromagnetic field (EMF) via moving charges does not have a ready solution, because the standard Hamiltonian of an EMF—whose time derivative should define the work according to the first law—is not gauge invariant. This limits applications of statistical me... [Phys. Rev. Lett. 121, 240602] Published Fri Dec 14, 2018

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Dynamical Critical Scaling of Long-Range Interacting Quantum Magnets (2018)

Nicolò Defenu, Tilman Enss, Michael Kastner, and Giovanna Morigi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): Nicolò Defenu, Tilman Enss, Michael Kastner, and Giovanna Morigi Slow quenches of the magnetic field across the paramagnetic-ferromagnetic phase transition of spin systems produce heat. In systems with short-range interactions the heat exhibits universal power-law scaling as a function of the quench rate, known as Kibble-Zurek scaling. In this work we analyze slo... [Phys. Rev. Lett. 121, 240403] Published Fri Dec 14, 2018

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Brownian Asymmetric Simple Exclusion Process (2018)

Dominik Lips, Artem Ryabov, and Philipp Maass

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-17

Beschreibung: Author(s): Dominik Lips, Artem Ryabov, and Philipp Maass We study the driven Brownian motion of hard rods in a one-dimensional cosine potential with a large amplitude compared to the thermal energy. In a closed system, we find surprising features of the steady-state current in dependence of the particle density. The form of the current-density relation ch... [Phys. Rev. Lett. 121, 160601] Published Tue Oct 16, 2018

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Experimental Determination of Irreversible Entropy Production in out-of-Equilibrium Mesoscopic Quantum Systems (2018)

M. Brunelli, L. Fusco, R. Landig, W. Wieczorek, J. Hoelscher-Obermaier, G. Landi, F. L. Semião, A. Ferraro, N. Kiesel, T. Donner, G. De Chiara, and M. Paternostro

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-18

Beschreibung: Author(s): M. Brunelli, L. Fusco, R. Landig, W. Wieczorek, J. Hoelscher-Obermaier, G. Landi, F. L. Semião, A. Ferraro, N. Kiesel, T. Donner, G. De Chiara, and M. Paternostro Physicists observe entropy production in two intermediate-scale quantum systems, indicating that the systems have undergone an irreversible process. [Phys. Rev. Lett. 121, 160604] Published Wed Oct 17, 2018

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Revealing Tensor Monopoles through Quantum-Metric Measurements (2018)

Giandomenico Palumbo and Nathan Goldman

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-25

Beschreibung: Author(s): Giandomenico Palumbo and Nathan Goldman Monopoles are intriguing topological objects, which play a central role in gauge theories and topological states of matter. While conventional monopoles are found in odd-dimensional flat spaces, such as the Dirac monopole in three dimensions and the non-Abelian Yang monopole in five dimensions, more... [Phys. Rev. Lett. 121, 170401] Published Wed Oct 24, 2018

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Entanglement Content of Quasiparticle Excitations (2018)

Olalla A. Castro-Alvaredo, Cecilia De Fazio, Benjamin Doyon, and István M. Szécsényi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-27

Beschreibung: Author(s): Olalla A. Castro-Alvaredo, Cecilia De Fazio, Benjamin Doyon, and István M. Szécsényi We investigate the quantum entanglement content of quasiparticle excitations in extended many-body systems. We show that such excitations give an additive contribution to the bipartite von Neumann and Rényi entanglement entropies that takes a simple, universal form. It is largely independent of the ... [Phys. Rev. Lett. 121, 170602] Published Fri Oct 26, 2018

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Three-Dimensional Nuclear Spin Positioning Using Coherent Radio-Frequency Control (2018)

J. Zopes, K. Herb, K. S. Cujia, and C. L. Degen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-27

Beschreibung: Author(s): J. Zopes, K. Herb, K. S. Cujia, and C. L. Degen Distance measurements via the dipolar interaction are fundamental to the application of nuclear magnetic resonance (NMR) to molecular structure determination, but they provide information on only the absolute distance r and polar angle θ between spins. In this Letter, we present a protocol to also r... [Phys. Rev. Lett. 121, 170801] Published Fri Oct 26, 2018

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Demonstration of Einstein-Podolsky-Rosen Steering Using Hybrid Continuous- and Discrete-Variable Entanglement of Light (2018)

A. Cavaillès, H. Le Jeannic, J. Raskop, G. Guccione, D. Markham, E. Diamanti, M. D. Shaw, V. B. Verma, S. W. Nam, and J. Laurat

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-27

Beschreibung: Author(s): A. Cavaillès, H. Le Jeannic, J. Raskop, G. Guccione, D. Markham, E. Diamanti, M. D. Shaw, V. B. Verma, S. W. Nam, and J. Laurat Einstein-Podolsky-Rosen steering is known to be a key resource for one-sided device-independent quantum information protocols. Here we demonstrate steering using hybrid entanglement between continuous- and discrete-variable optical qubits. To this end, we report on suitable steering inequalities and... [Phys. Rev. Lett. 121, 170403] Published Fri Oct 26, 2018

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Device-Independent Entanglement Certification of All Entangled States (2018)

Joseph Bowles, Ivan Šupić, Daniel Cavalcanti, and Antonio Acín

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-30

Beschreibung: Author(s): Joseph Bowles, Ivan Šupić, Daniel Cavalcanti, and Antonio Acín We present a method to certify the entanglement of all entangled quantum states in a device-independent way. This is achieved by placing the state in a quantum network and constructing a correlation inequality based on an entanglement witness for the state. Our method is device independent, in the s... [Phys. Rev. Lett. 121, 180503] Published Mon Oct 29, 2018

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Beliaev Damping of a Spin-Orbit-Coupled Bose-Einstein Condensate (2018)

Rukuan Wu and Zhaoxin Liang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-31

Beschreibung: Author(s): Rukuan Wu and Zhaoxin Liang Beliaev damping provides a fundamental mechanism for dissipation of quasiparticles. Previous research has shown that the two-component internal degrees of freedom has no nontrivial effect on Beliaev damping. Here we provide the first example where the spinor nature of Bose gases can manifest itself ... [Phys. Rev. Lett. 121, 180401] Published Tue Oct 30, 2018

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Robust Entanglement Gates for Trapped-Ion Qubits (2018)

Yotam Shapira, Ravid Shaniv, Tom Manovitz, Nitzan Akerman, and Roee Ozeri

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-02

Beschreibung: Author(s): Yotam Shapira, Ravid Shaniv, Tom Manovitz, Nitzan Akerman, and Roee Ozeri High-fidelity two-qubit entangling gates play an important role in many quantum information processing tasks and are a necessary building block for constructing a universal quantum computer. Such high-fidelity gates have been demonstrated on trapped-ion qubits; however, control errors and noise in g... [Phys. Rev. Lett. 121, 180502] Published Thu Nov 01, 2018

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Quantum Error Correction Decoheres Noise (2018)

Stefanie J. Beale, Joel J. Wallman, Mauricio Gutiérrez, Kenneth R. Brown, and Raymond Laflamme

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-06

Beschreibung: Author(s): Stefanie J. Beale, Joel J. Wallman, Mauricio Gutiérrez, Kenneth R. Brown, and Raymond Laflamme Typical studies of quantum error correction assume probabilistic Pauli noise, largely because it is relatively easy to analyze and simulate. Consequently, the effective logical noise due to physically realistic coherent errors is relatively unknown. Here, we prove that encoding a system in a stabili... [Phys. Rev. Lett. 121, 190501] Published Mon Nov 05, 2018

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Quantum Annealing and Thermalization: Insights from Integrability (2018)

Fuxiang Li, Vladimir Y. Chernyak, and Nikolai A. Sinitsyn

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-07

Beschreibung: Author(s): Fuxiang Li, Vladimir Y. Chernyak, and Nikolai A. Sinitsyn We solve a model that has basic features that are desired for quantum annealing computations: entanglement in the ground state, controllable annealing speed, ground state energy separated by a gap during the whole evolution, and a programmable computational problem that is encoded by parameters of t... [Phys. Rev. Lett. 121, 190601] Published Tue Nov 06, 2018

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Universal Statistics of Topological Defects Formed in a Quantum Phase Transition (2018)

Adolfo del Campo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-15

Beschreibung: Author(s): Adolfo del Campo When a quantum phase transition is crossed in finite time, critical slowing down leads to the breakdown of adiabatic dynamics and the formation of topological defects. The average density of defects scales with the quench rate following a universal power law predicted by the Kibble-Zurek mechanism. ... [Phys. Rev. Lett. 121, 200601] Published Wed Nov 14, 2018

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Cooling a Bose Gas by Three-Body Losses (2018)

Max Schemmer and Isabelle Bouchoule

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-17

Beschreibung: Author(s): Max Schemmer and Isabelle Bouchoule We report the demonstration of cooling by three-body losses in a Bose gas. We use a harmonically confined one-dimensional (1D) Bose gas in the quasicondensate regime and, as the atom number decreases under the effect of three-body losses, the temperature T drops up to a factor of 4. The ratio k B T / ( m ... [Phys. Rev. Lett. 121, 200401] Published Fri Nov 16, 2018

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Tan’s Contact for Trapped Lieb-Liniger Bosons at Finite Temperature (2018)

Hepeng Yao, David Clément, Anna Minguzzi, Patrizia Vignolo, and Laurent Sanchez-Palencia

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Hepeng Yao, David Clément, Anna Minguzzi, Patrizia Vignolo, and Laurent Sanchez-Palencia The universal Tan relations connect a variety of microscopic features of many-body quantum systems with two-body contact interactions to a single quantity, called the contact. The latter has become pivotal in the description of quantum gases. We provide a complete characterization of the Tan contact... [Phys. Rev. Lett. 121, 220402] Published Tue Nov 27, 2018

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Entanglement as the Symmetric Portion of Correlated Coherence (2018)

Kok Chuan Tan and Hyunseok Jeong

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Kok Chuan Tan and Hyunseok Jeong We show that the symmetric portion of correlated coherence is always a valid quantifier of entanglement, and that this property is independent of the particular choice of coherence measure. This leads to an infinitely large class of coherence based entanglement monotones, which is always computable ... [Phys. Rev. Lett. 121, 220401] Published Tue Nov 27, 2018

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From Linear to Nonlinear Responses of Thermal Pure Quantum States (2018)

Hiroyuki Endo, Chisa Hotta, and Akira Shimizu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-29

Beschreibung: Author(s): Hiroyuki Endo, Chisa Hotta, and Akira Shimizu We propose a self-validating scheme to calculate the unbiased responses of quantum many-body systems to external fields of arbitrary strength at any temperature. By switching on a specified field to a thermal pure quantum state of an isolated system, and tracking its time evolution, one can observe ... [Phys. Rev. Lett. 121, 220601] Published Wed Nov 28, 2018

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Light-Induced Coherence in an Atom-Cavity System (2018)

Christoph Georges, Jayson G. Cosme, Ludwig Mathey, and Andreas Hemmerich

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-30

Beschreibung: Author(s): Christoph Georges, Jayson G. Cosme, Ludwig Mathey, and Andreas Hemmerich We demonstrate a light-induced formation of coherence in a cold atomic gas system that utilizes the suppression of a competing density wave (DW) order. The condensed atoms are placed in an optical cavity and pumped by an external optical standing wave, which induces a long-range interaction mediated... [Phys. Rev. Lett. 121, 220405] Published Thu Nov 29, 2018

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Diffusing up the Hill: Dynamics and Equipartition in Highly Unstable Systems (2018)

Martin Šiler, Luca Ornigotti, Oto Brzobohatý, Petr Jákl, Artem Ryabov, Viktor Holubec, Pavel Zemánek, and Radim Filip

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): Martin Šiler, Luca Ornigotti, Oto Brzobohatý, Petr Jákl, Artem Ryabov, Viktor Holubec, Pavel Zemánek, and Radim Filip Stochastic motion of particles in a highly unstable potential generates a number of diverging trajectories leading to undefined statistical moments of the particle position. This makes experiments challenging and breaks down a standard statistical analysis of unstable mechanical processes and their ... [Phys. Rev. Lett. 121, 230601] Published Mon Dec 03, 2018

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Quantum Advantage from Sequential-Transformation Contextuality (2018)

Shane Mansfield and Elham Kashefi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): Shane Mansfield and Elham Kashefi We introduce a notion of contextuality for transformations in sequential contexts, distinct from the Bell-Kochen-Specker and Spekkens notions of contextuality. Within a transformation-based model for quantum computation we show that strong sequential-transformation contextuality is necessary and suf... [Phys. Rev. Lett. 121, 230401] Published Mon Dec 03, 2018

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Quantum Non-Markovian Processes Break Conditional Past-Future Independence (2018)

Adrián A. Budini

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-12

Beschreibung: Author(s): Adrián A. Budini For classical Markovian stochastic systems, past and future events become statistically independent when conditioned to a given state at the present time. Memory non-Markovian effects break this condition, inducing a nonvanishing conditional past-future correlation. Here, this classical memory indic... [Phys. Rev. Lett. 121, 240401] Published Tue Dec 11, 2018

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Quantum Schur Sampling Circuits can be Strongly Simulated (2018)

Vojtěch Havlíček and Sergii Strelchuk

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Vojtěch Havlíček and Sergii Strelchuk Permutational quantum computing (PQC) [ Quantum Inf. Comput. , 10 , 470–497 (2010)] is a natural quantum computational model conjectured to capture nonclassical aspects of quantum computation. An argument backing this conjecture was the observation that there was no efficient classical algorithm for es... [Phys. Rev. Lett. 121, 060505] Published Wed Aug 08, 2018

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Achieving Heisenberg-Scaling Precision with Projective Measurement on Single Photons (2018)

Geng Chen, Lijian Zhang, Wen-Hao Zhang, Xing-Xiang Peng, Liang Xu, Zhao-Di Liu, Xiao-Ye Xu, Jian-Shun Tang, Yong-Nan Sun, De-Yong He, Jin-Shi Xu, Zong-Quan Zhou, Chuan-Feng Li, and Guang-Can Guo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-09

Beschreibung: Author(s): Geng Chen, Lijian Zhang, Wen-Hao Zhang, Xing-Xiang Peng, Liang Xu, Zhao-Di Liu, Xiao-Ye Xu, Jian-Shun Tang, Yong-Nan Sun, De-Yong He, Jin-Shi Xu, Zong-Quan Zhou, Chuan-Feng Li, and Guang-Can Guo It has been suggested that both quantum superpositions and nonlinear interactions are important resources for quantum metrology. However, to date the different roles that these two resources play in the precision enhancement are not well understood. Here, we experimentally demonstrate a Heisenberg-s... [Phys. Rev. Lett. 121, 060506] Published Wed Aug 08, 2018

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Steady-State Coherences by Composite System-Bath Interactions (2018)

Giacomo Guarnieri, Michal Kolář, and Radim Filip

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-16

Beschreibung: Author(s): Giacomo Guarnieri, Michal Kolář, and Radim Filip We identify sufficient conditions on the structure of the interaction Hamiltonian between a two-level quantum system and a thermal bath that, without any external drive or coherent measurement, guarantee the generation of steady-state coherences (SSC). The SSC obtained this way, remarkably, turn out... [Phys. Rev. Lett. 121, 070401] Published Wed Aug 15, 2018

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Robust Spin Squeezing via Photon-Mediated Interactions on an Optical Clock Transition (2018)

Robert J. Lewis-Swan, Matthew A. Norcia, Julia R. K. Cline, James K. Thompson, and Ana Maria Rey

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-17

Beschreibung: Author(s): Robert J. Lewis-Swan, Matthew A. Norcia, Julia R. K. Cline, James K. Thompson, and Ana Maria Rey Cavity QED is a promising avenue for the deterministic generation of entangled and spin-squeezed states for quantum metrology. One archetypal scheme generates squeezing via collective one-axis twisting interactions. However, we show that in implementations using optical transitions in long-lived ato... [Phys. Rev. Lett. 121, 070403] Published Thu Aug 16, 2018

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Binomial Spin Glass (2018)

Mohammad-Sadegh Vaezi, Gerardo Ortiz, Martin Weigel, and Zohar Nussinov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-23

Beschreibung: Author(s): Mohammad-Sadegh Vaezi, Gerardo Ortiz, Martin Weigel, and Zohar Nussinov To establish a unified framework for studying both discrete and continuous coupling distributions, we introduce the binomial spin glass, a class of models where the couplings are sums of m identically distributed Bernoulli random variables. In the continuum limit m → ∞ , the class reduces to one with G... [Phys. Rev. Lett. 121, 080601] Published Wed Aug 22, 2018

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Thermodynamic Bound on Heat-to-Power Conversion (2018)

Rongxiang Luo, Giuliano Benenti, Giulio Casati, and Jiao Wang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-23

Beschreibung: Author(s): Rongxiang Luo, Giuliano Benenti, Giulio Casati, and Jiao Wang In systems described by the scattering theory, there is an upper bound, lower than Carnot, on the efficiency of steady-state heat-to-work conversion at a given output power. We show that interacting systems can overcome such bound and saturate, in the thermodynamic limit, the much more favorable lin... [Phys. Rev. Lett. 121, 080602] Published Wed Aug 22, 2018

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Quantum-Limited Time-Frequency Estimation through Mode-Selective Photon Measurement (2018)

J. M. Donohue, V. Ansari, J. Řeháček, Z. Hradil, B. Stoklasa, M. Paúr, L. L. Sánchez-Soto, and C. Silberhorn

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): J. M. Donohue, V. Ansari, J. Řeháček, Z. Hradil, B. Stoklasa, M. Paúr, L. L. Sánchez-Soto, and C. Silberhorn By projecting onto complex optical mode profiles, it is possible to estimate arbitrarily small separations between objects with quantum-limited precision, free of uncertainty arising from overlapping intensity profiles. Here we extend these techniques to the time-frequency domain using mode-selectiv... [Phys. Rev. Lett. 121, 090501] Published Mon Aug 27, 2018

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Coalescence of Two Impurities in a Trapped One-dimensional Bose Gas (2018)

A. S. Dehkharghani, A. G. Volosniev, and N. T. Zinner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): A. S. Dehkharghani, A. G. Volosniev, and N. T. Zinner We study the ground state of a one-dimensional (1D) trapped Bose gas with two mobile impurity particles. To investigate this setup, we develop a variational procedure in which the coordinates of the impurity particles are slowlike variables. We validate our method using the exact results obtained fo... [Phys. Rev. Lett. 121, 080405] Published Fri Aug 24, 2018

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Arcsine Laws in Stochastic Thermodynamics (2018)

Andre C. Barato, Édgar Roldán, Ignacio A. Martínez, and Simone Pigolotti

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-29

Beschreibung: Author(s): Andre C. Barato, Édgar Roldán, Ignacio A. Martínez, and Simone Pigolotti We show that the fraction of time that a thermodynamic current spends above its average value follows the arcsine law, a prominent result obtained by Lévy for Brownian motion. Stochastic currents with long streaks above or below their average are much more likely than those that spend similar fracti... [Phys. Rev. Lett. 121, 090601] Published Tue Aug 28, 2018

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Topology of One-Dimensional Quantum Systems Out of Equilibrium (2018)

Max McGinley and Nigel R. Cooper

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-30

Beschreibung: Author(s): Max McGinley and Nigel R. Cooper We study the topological properties of one-dimensional systems undergoing unitary time evolution. We show that symmetries possessed both by the initial wave function and by the Hamiltonian at all times may not be present in the time-dependent wave function—a phenomenon which we dub “dynamically indu... [Phys. Rev. Lett. 121, 090401] Published Wed Aug 29, 2018

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Daniel González-Cuadra, Przemysław R. Grzybowski, Alexandre Dauphin, and Maciej Lewenstein

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-31

Beschreibung: Author(s): Daniel González-Cuadra, Przemysław R. Grzybowski, Alexandre Dauphin, and Maciej Lewenstein We study a one-dimensional system of strongly correlated bosons on a dynamical lattice. To this end, we extend the standard Bose-Hubbard Hamiltonian to include extra degrees of freedom on the bonds of the lattice. We show that this minimal model exhibits phenomena reminiscent of fermion-phonon model... [Phys. Rev. Lett. 121, 090402] Published Thu Aug 30, 2018

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Violation of the Harris-Barghathi-Vojta Criterion (2018)

Manuel Schrauth, Jefferson S. E. Portela, and Florian Goth

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Manuel Schrauth, Jefferson S. E. Portela, and Florian Goth In 1974, Harris proposed his celebrated criterion: Continuous phase transitions in d -dimensional systems are stable against quenched spatial randomness whenever d ν 〉 2 , where ν is the clean critical exponent of the correlation length. Forty years later, motivated by violations of the Harris criteri... [Phys. Rev. Lett. 121, 100601] Published Tue Sep 04, 2018

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Observation of Topologically Protected Edge States in a Photonic Two-Dimensional Quantum Walk (2018)

Chao Chen, Xing Ding, Jian Qin, Yu He, Yi-Han Luo, Ming-Cheng Chen, Chang Liu, Xi-Lin Wang, Wei-Jun Zhang, Hao Li, Li-Xing You, Zhen Wang, Da-Wei Wang, Barry C. Sanders, Chao-Yang Lu, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-07

Beschreibung: Author(s): Chao Chen, Xing Ding, Jian Qin, Yu He, Yi-Han Luo, Ming-Cheng Chen, Chang Liu, Xi-Lin Wang, Wei-Jun Zhang, Hao Li, Li-Xing You, Zhen Wang, Da-Wei Wang, Barry C. Sanders, Chao-Yang Lu, and Jian-Wei Pan Periodically driven systems have displayed a variety of fascinating phenomena without analogies in static systems, which enrich the classification of quantum phases of matter and stimulate a wide range of research interests. Here, we employ discrete-time quantum walks to investigate a nontrivial top... [Phys. Rev. Lett. 121, 100502] Published Thu Sep 06, 2018

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Quantum-Limited Atomic Receiver in the Electrically Small Regime (2018)

Kevin C. Cox, David H. Meyer, Fredrik K. Fatemi, and Paul D. Kunz

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-12

Beschreibung: Author(s): Kevin C. Cox, David H. Meyer, Fredrik K. Fatemi, and Paul D. Kunz We use a quantum sensor based on thermal Rydberg atoms to receive data encoded in electromagnetic fields in the extreme electrically small regime, with a sensing volume over 1 0 7 times smaller than the cube of the electric field wavelength. We introduce the standard quantum limit for data capacity, a... [Phys. Rev. Lett. 121, 110502] Published Tue Sep 11, 2018

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Relativistic Measurement Backaction in the Quantum Dirac Oscillator (2018)

Keye Zhang, Lu Zhou, Pierre Meystre, and Weiping Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-12

Beschreibung: Author(s): Keye Zhang, Lu Zhou, Pierre Meystre, and Weiping Zhang An elegant method to circumvent quantum measurement backaction is the use of quantum mechanics free subsystems (QMFS), with one approach involving the use of two oscillators with effective masses of opposite signs. Since negative energies, and hence masses, are a characteristic of relativistic syste... [Phys. Rev. Lett. 121, 110401] Published Tue Sep 11, 2018

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

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Single-Loop Realization of Arbitrary Nonadiabatic Holonomic Single-Qubit Quantum Gates in a Superconducting Circuit (2018)

Y. Xu, W. Cai, Y. Ma, X. Mu, L. Hu, Tao Chen, H. Wang, Y. P. Song, Zheng-Yuan Xue, Zhang-qi Yin, and L. Sun

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-12

Beschreibung: Author(s): Y. Xu, W. Cai, Y. Ma, X. Mu, L. Hu, Tao Chen, H. Wang, Y. P. Song, Zheng-Yuan Xue, Zhang-qi Yin, and L. Sun Geometric phases are noise resilient, and thus provide a robust way towards high-fidelity quantum manipulation. Here we experimentally demonstrate arbitrary nonadiabatic holonomic single-qubit quantum gates for both a superconducting transmon qubit and a microwave cavity in a single-loop way. In bot... [Phys. Rev. Lett. 121, 110501] Published Tue Sep 11, 2018

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

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Quantum Anomaly and 2D-3D Crossover in Strongly Interacting Fermi Gases (2018)

T. Peppler, P. Dyke, M. Zamorano, I. Herrera, S. Hoinka, and C. J. Vale

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): T. Peppler, P. Dyke, M. Zamorano, I. Herrera, S. Hoinka, and C. J. Vale We present an experimental investigation of collective oscillations in harmonically trapped Fermi gases through the crossover from two to three dimensions. Specifically, we measure the frequency of the radial monopole oscillation or breathing mode in highly oblate gases with tunable interactions. Th... [Phys. Rev. Lett. 121, 120402] Published Mon Sep 17, 2018

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

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Qudit-Basis Universal Quantum Computation Using ${χ}^{(2)}$ Interactions (2018)

Murphy Yuezhen Niu, Isaac L. Chuang, and Jeffrey H. Shapiro

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-04-19

Beschreibung: Author(s): Murphy Yuezhen Niu, Isaac L. Chuang, and Jeffrey H. Shapiro We prove that universal quantum computation can be realized—using only linear optics and χ ( 2 ) (three-wave mixing) interactions—in any ( n + 1 )-dimensional qudit basis of the n -pump-photon subspace. First, we exhibit a strictly universal gate set for the qubit basis in the one-pump-photon subspace. Next... [Phys. Rev. Lett. 120, 160502] Published Wed Apr 18, 2018

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Scissors Mode of Dipolar Quantum Droplets of Dysprosium Atoms (2018)

Igor Ferrier-Barbut, Matthias Wenzel, Fabian Böttcher, Tim Langen, Mathieu Isoard, Sandro Stringari, and Tilman Pfau

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-04-19

Beschreibung: Author(s): Igor Ferrier-Barbut, Matthias Wenzel, Fabian Böttcher, Tim Langen, Mathieu Isoard, Sandro Stringari, and Tilman Pfau We report on the observation of the scissors mode of a single dipolar quantum droplet. The existence of this mode is due to the breaking of the rotational symmetry by the dipole-dipole interaction, which is fixed along an external homogeneous magnetic field. By modulating the orientation of this mag... [Phys. Rev. Lett. 120, 160402] Published Wed Apr 18, 2018

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Sustained State-Independent Quantum Contextual Correlations from a Single Ion (2018)

F. M. Leupold, M. Malinowski, C. Zhang, V. Negnevitsky, J. Alonso, J. P. Home, and A. Cabello

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-05-05

Beschreibung: Author(s): F. M. Leupold, M. Malinowski, C. Zhang, V. Negnevitsky, J. Alonso, J. P. Home, and A. Cabello We use a single trapped-ion qutrit to demonstrate the quantum-state-independent violation of noncontextuality inequalities using a sequence of randomly chosen quantum nondemolition projective measurements. We concatenate 53 × 10 6 sequential measurements of 13 observables, and unambiguously violate an ... [Phys. Rev. Lett. 120, 180401] Published Fri May 04, 2018

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