PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Recently published articles in Phys. Rev. Lett. in the Table of Content section "General Physics: Statistical and Quantum Mechanics, Quantum Information, etc."
Updated: 17 hours 39 min ago

Electro-Optic Frequency Beam Splitters and Tritters for High-Fidelity Photonic Quantum Information Processing

Thu, 2018-01-18 11:00

Author(s): Hsuan-Hao Lu, Joseph M. Lukens, Nicholas A. Peters, Ogaga D. Odele, Daniel E. Leaird, Andrew M. Weiner, and Pavel Lougovski

We report the experimental realization of high-fidelity photonic quantum gates for frequency-encoded qubits and qutrits based on electro-optic modulation and Fourier-transform pulse shaping. Our frequency version of the Hadamard gate offers near-unity fidelity (0.99998±0.00003), requires only a sing...

[Phys. Rev. Lett. 120, 030502] Published Thu Jan 18, 2018

Categories: Journals, Physics

Experimental High-Dimensional Einstein-Podolsky-Rosen Steering

Tue, 2018-01-16 11:00

Author(s): Qiang Zeng, Bo Wang, Pengyun Li, and Xiangdong Zhang

Steering nonlocality is the fundamental property of quantum mechanics, which has been widely demonstrated in some systems with qubits. Recently, theoretical works have shown that the high-dimensional (HD) steering effect exhibits novel and important features, such as noise suppression, which appear ...

[Phys. Rev. Lett. 120, 030401] Published Tue Jan 16, 2018

Categories: Journals, Physics

Light-Cone and Diffusive Propagation of Correlations in a Many-Body Dissipative System

Fri, 2018-01-12 11:00

Author(s): Jean-Sébastien Bernier, Ryan Tan, Lars Bonnes, Chu Guo, Dario Poletti, and Corinna Kollath

We analyze the propagation of correlations after a sudden interaction change in a strongly interacting quantum system in contact with an environment. In particular, we consider an interaction quench in the Bose-Hubbard model, deep within the Mott-insulating phase, under the effect of dephasing. We o...

[Phys. Rev. Lett. 120, 020401] Published Fri Jan 12, 2018

Categories: Journals, Physics

Quantum States with a Positive Partial Transpose are Useful for Metrology

Fri, 2018-01-12 11:00

Author(s): Géza Tóth and Tamás Vértesi

We show that multipartite quantum states that have a positive partial transpose with respect to all bipartitions of the particles can outperform separable states in linear interferometers. We introduce a powerful iterative method to find such states. We present some examples for multipartite states ...

[Phys. Rev. Lett. 120, 020506] Published Fri Jan 12, 2018

Categories: Journals, Physics

Defect in the Joint Spectrum of Hydrogen due to Monodromy

Fri, 2018-01-12 11:00

Author(s): Holger R. Dullin and Holger Waalkens

The joint spectrum of the three commuting operators associated with the description of the hydrogen atom in prolate spheroidal coordinates is shown to have a defect.

[Phys. Rev. Lett. 120, 020507] Published Fri Jan 12, 2018

Categories: Journals, Physics

Lossless Brownian Information Engine

Fri, 2018-01-12 11:00

Author(s): Govind Paneru, Dong Yun Lee, Tsvi Tlusty, and Hyuk Kyu Pak

We report on a lossless information engine that converts nearly all available information from an error-free feedback protocol into mechanical work. Combining high-precision detection at a resolution of 1 nm with ultrafast feedback control, the engine is tuned to extract the maximum work from inform...

[Phys. Rev. Lett. 120, 020601] Published Fri Jan 12, 2018

Categories: Journals, Physics

Imaging Correlations in Heterodyne Spectra for Quantum Displacement Sensing

Wed, 2018-01-10 11:00

Author(s): A. Pontin, J. E. Lang, A. Chowdhury, P. Vezio, F. Marino, B. Morana, E. Serra, F. Marin, and T. S. Monteiro

The extraordinary sensitivity of the output field of an optical cavity to small quantum-scale displacements has led to breakthroughs such as the first detection of gravitational waves and of the motions of quantum ground-state cooled mechanical oscillators. While heterodyne detection of the output o...

[Phys. Rev. Lett. 120, 020503] Published Wed Jan 10, 2018

Categories: Journals, Physics

Towards Device-Independent Information Processing on General Quantum Networks

Wed, 2018-01-10 11:00

Author(s): Ciarán M. Lee and Matty J. Hoban

The violation of certain Bell inequalities allows for device-independent information processing secure against nonsignaling eavesdroppers. However, this only holds for the Bell network, in which two or more agents perform local measurements on a single shared source of entanglement. To overcome the ...

[Phys. Rev. Lett. 120, 020504] Published Wed Jan 10, 2018

Categories: Journals, Physics

Incoherent Qubit Control Using the Quantum Zeno Effect

Wed, 2018-01-10 11:00

Author(s): S. Hacohen-Gourgy, L. P. García-Pintos, L. S. Martin, J. Dressel, and I. Siddiqi

The quantum Zeno effect is the suppression of Hamiltonian evolution by repeated observation, which pins the system to an eigenstate of the measurement observable. Using measurement alone, control of the state can be achieved if the observable is slowly varied, so that the state tracks the now time-d...

[Phys. Rev. Lett. 120, 020505] Published Wed Jan 10, 2018

Categories: Journals, Physics

Robust 2-Qubit Gates in a Linear Ion Crystal Using a Frequency-Modulated Driving Force

Tue, 2018-01-09 11:00

Author(s): Pak Hong Leung, Kevin A. Landsman, Caroline Figgatt, Norbert M. Linke, Christopher Monroe, and Kenneth R. Brown

In an ion trap quantum computer, collective motional modes are used to entangle two or more qubits in order to execute multiqubit logical gates. Any residual entanglement between the internal and motional states of the ions results in loss of fidelity, especially when there are many spectator ions i...

[Phys. Rev. Lett. 120, 020501] Published Tue Jan 09, 2018

Categories: Journals, Physics

Quantum Transduction with Adaptive Control

Tue, 2018-01-09 11:00

Author(s): Mengzhen Zhang, Chang-Ling Zou, and Liang Jiang

Quantum transducers play a crucial role in hybrid quantum networks. A good quantum transducer can faithfully convert quantum signals from one mode to another with minimum decoherence. Most investigations of quantum transduction are based on the protocol of direct mode conversion. However, the direct...

[Phys. Rev. Lett. 120, 020502] Published Tue Jan 09, 2018

Categories: Journals, Physics

Experimental Verification of a Jarzynski-Related Information-Theoretic Equality by a Single Trapped Ion

Fri, 2018-01-05 11:00

Author(s): T. P. Xiong, L. L. Yan, F. Zhou, K. Rehan, D. F. Liang, L. Chen, W. L. Yang, Z. H. Ma, M. Feng, and V. Vedral

Strong spin-orbit coupling in an iridate compound causes anisotropic lattice expansion when a small current is applied.

[Phys. Rev. Lett. 120, 010601] Published Fri Jan 05, 2018

Categories: Journals, Physics

Controlled-<span class="sc">phase</span> Gate for Photons Based on Stationary Light

Thu, 2018-01-04 11:00

Author(s): Ivan Iakoupov, Johannes Borregaard, and Anders S. Sørensen

We propose a method to induce strong effective interactions between photons mediated by an atomic ensemble. To achieve this, we use the so-called stationary light effect to enhance the interaction. Regardless of the single-atom coupling to light, the interaction strength between the photons can be e...

[Phys. Rev. Lett. 120, 010502] Published Thu Jan 04, 2018

Categories: Journals, Physics

High-Speed Device-Independent Quantum Random Number Generation without a Detection Loophole

Wed, 2018-01-03 11:00

Author(s): Yang Liu, Xiao Yuan, Ming-Han Li, Weijun Zhang, Qi Zhao, Jiaqiang Zhong, Yuan Cao, Yu-Huai Li, Luo-Kan Chen, Hao Li, Tianyi Peng, Yu-Ao Chen, Cheng-Zhi Peng, Sheng-Cai Shi, Zhen Wang, Lixing You, Xiongfeng Ma, Jingyun Fan, Qiang Zhang, and Jian-Wei Pan

Quantum mechanics provides the means of generating genuine randomness that is impossible with deterministic classical processes. Remarkably, the unpredictability of randomness can be certified in a manner that is independent of implementation devices. Here, we present an experimental study of device...

[Phys. Rev. Lett. 120, 010503] Published Wed Jan 03, 2018

Categories: Journals, Physics

High-Fidelity Preservation of Quantum Information During Trapped-Ion Transport

Tue, 2018-01-02 11:00

Author(s): Peter Kaufmann, Timm F. Gloger, Delia Kaufmann, Michael Johanning, and Christof Wunderlich

A promising scheme for building scalable quantum simulators and computers is the synthesis of a scalable system using interconnected subsystems. A prerequisite for this approach is the ability to faithfully transfer quantum information between subsystems. With trapped atomic ions, this can be realiz...

[Phys. Rev. Lett. 120, 010501] Published Tue Jan 02, 2018

Categories: Journals, Physics

Liquid-Gas Transitions in Steady Heat Conduction

Fri, 2017-12-29 11:00

Author(s): Naoko Nakagawa and Shin-ichi Sasa

We study liquid-gas transitions of heat conduction systems in contact with two heat baths under constant pressure in the linear response regime. On the basis of local equilibrium thermodynamics, we propose an equality with a global temperature, which determines the volume near the equilibrium liquid...

[Phys. Rev. Lett. 119, 260602] Published Fri Dec 29, 2017

Categories: Journals, Physics

High-Resolution Quantum Sensing with Shaped Control Pulses

Thu, 2017-12-28 11:00

Author(s): J. Zopes, K. Sasaki, K. S. Cujia, J. M. Boss, K. Chang, T. F. Segawa, K. M. Itoh, and C. L. Degen

We investigate the application of amplitude-shaped control pulses for enhancing the time and frequency resolution of multipulse quantum sensing sequences. Using the electronic spin of a single nitrogen-vacancy center in diamond and up to 10 000 coherent microwave pulses with a cosine square envelope...

[Phys. Rev. Lett. 119, 260501] Published Thu Dec 28, 2017

Categories: Journals, Physics

Oscillations in Aggregation-Shattering Processes

Thu, 2017-12-28 11:00

Author(s): S. A. Matveev, P. L. Krapivsky, A. P. Smirnov, E. E. Tyrtyshnikov, and N. V. Brilliantov

We observe never-ending oscillations in systems undergoing collision-controlled aggregation and shattering. Specifically, we investigate aggregation-shattering processes with aggregation kernels Ki,j=(i/j)a+(j/i)a and shattering kernels Fi,j=λKi,j, where i and j are cluster sizes, and parameter λ qu...

[Phys. Rev. Lett. 119, 260601] Published Thu Dec 28, 2017

Categories: Journals, Physics

Observation of Slow Dynamics near the Many-Body Localization Transition in One-Dimensional Quasiperiodic Systems

Wed, 2017-12-27 11:00

Author(s): Henrik P. Lüschen, Pranjal Bordia, Sebastian Scherg, Fabien Alet, Ehud Altman, Ulrich Schneider, and Immanuel Bloch

In the presence of sufficiently strong disorder or quasiperiodic fields, an interacting many-body system can fail to thermalize and become many-body localized. The associated transition is of particular interest, since it occurs not only in the ground state but over an extended range of energy densi...

[Phys. Rev. Lett. 119, 260401] Published Wed Dec 27, 2017

Categories: Journals, Physics

Landau Phonon-Roton Theory Revisited for Superfluid $^{4}\mathrm{He}$ and Fermi Gases

Tue, 2017-12-26 11:00

Author(s): Yvan Castin, Alice Sinatra, and Hadrien Kurkjian

Liquid helium and spin-1/2 cold-atom Fermi gases both exhibit in their superfluid phase two distinct types of excitations, gapless phonons and gapped rotons or fermionic pair-breaking excitations. In the long wavelength limit, revising and extending the theory of Landau and Khalatnikov initially dev...

[Phys. Rev. Lett. 119, 260402] Published Tue Dec 26, 2017

Categories: Journals, Physics