Showing 2019 · quant-phShow all

90 papers · 2 filters

quant-ph2019★ 143 cited

Quantum Adversarial Machine Learning

Sirui Lu, Lu-Ming Duan, Dong-Ling Deng

Adversarial machine learning is an emerging field that focuses on studying vulnerabilities of machine learning approaches in adversarial settings and developing techniques accordin…

quant-ph2019★ 46 cited

Stationary State Degeneracy of Open Quantum Systems with Non-Abelian Symmetries

Zhao Zhang, Joseph Tindall, Jordi Mur-Petit +2

We study the null space degeneracy of open quantum systems with multiple non-Abelian, strong symmetries. By decomposing the Hilbert space representation of these symmetries into an…

quant-ph2019★ 6 cited

Solving Quantum Statistical Mechanics with Variational Autoregressive Networks and Quantum Circuits

Jin-Guo Liu, Liang Mao, Pan Zhang +1

We extend the ability of unitary quantum circuits by interfacing it with classical autoregressive neural networks. The combined model parametrizes a variational density matrix as a…

quant-ph2019★ 3 cited

Experimental Test of Leggett's Inequalities with Solid-State Spins

Xianzhi Huang, Xiaolong Ouyang, Wenqian Lian +9

Bell's theorem states that no local hidden variable model is compatible with quantum mechanics. Surprisingly, even if we release the locality constraint, certain nonlocal hidden va…

quant-ph2019

Realization of two-dimensional crystal of ions in a monolithic Paul trap

Ye Wang, Mu Qiao, Zhengyang Cai +9

We present a simple Paul trap that stably accommodates up to a couple of dozens of \ensuremath{^{171}\mathrm{Yb}^+~} ions in a stationary two-dimensional lattice. The trap is const…

quant-ph2019★ 25 cited

Artificial Neural Network Based Computation for Out-of-Time-Ordered Correlators

Yukai Wu, L. -M. Duan, Dong-Ling Deng

Out-of-time-ordered correlators (OTOCs) are of crucial importance for studying a wide variety of fundamental phenomena in quantum physics, ranging from information scrambling to qu…

quant-ph2019★ 110 cited

Tunable coupler for realizing a controlled-phase gate with dynamically decoupled regime in a superconducting circuit

X. Li, T. Cai, H. Yan +13

Controllable interaction between superconducting qubits is desirable for large-scale quantum computation and simulation. Here, based on a theoretical proposal by Yan et al. [Phys.…

quant-ph2019★ 5 cited

Tighter constraints of multiqubit entanglement for negativity

Long-Mei Yang, Bin Chen, Shao-Ming Fei +1

We provide a characterization of multiqubit entanglement monogamy and polygamy constraints in terms of negativity. Using the square of convex-roof extended negativity (SCREN) and t…

quant-ph2019★ 1 cited

A hybrid waveguide scheme for silicon-based quantum photonic circuits with quantum light sources

Lingjie Yu, Chenzhi Yuan, Renduo Qi Yidong Huang +1

We propose a hybrid silicon waveguide scheme to avoid the impact of noise photons induced by pump lights in application scenarios of quantum photonic circuits with quantum light so…

quant-ph2019★ 12 cited

High dimensional entanglement between a photon and a multiplexed atomic quantum memory

Chang Li, Yukai Wu, Wei Chang +4

Multiplexed quantum memories and high-dimensional entanglement can improve the performance of quantum repeaters by promoting the entanglement generation rate and the quantum commun…

quant-ph2019★ 2 cited

Simultaneous Certification of Entangled States and Measurements in Bounded Dimensional Semi-Quantum Games

Xingjian Zhang, Qi Zhao

Certification of quantum systems and operations is a central task in quantum information processing. Most current schemes rely on a tomography with fully characterised devices, whi…

quant-ph2019★ 20 cited

Quantum gate verification and its application in property testing

Pei Zeng, You Zhou, Zhenhuan Liu

To guarantee the normal functioning of quantum devices in different scenarios, appropriate benchmarking tool kits are quite significant. Inspired by the recent progress on quantum…

quant-ph2019★ 46 cited

Creation of 2000-atom Greenberger-Horne-Zeilinger states by entanglement amplification

Yajuan Zhao, Rui Zhang, Wenlan Chen +2

We propose a novel entanglement-creation scheme in a multi-atom ensemble, named entanglement amplification, which converts unentangled states into entangled states and amplifies le…

quant-ph2019★ 392 cited

Sending-or-Not-Sending with Independent Lasers: Secure Twin-Field Quantum Key Distribution Over 509 km

Jiu-Peng Chen, Chi Zhang, Yang Liu +15

Twin field quantum key distribution promises high key rates at long distance to beat the rate distance limit. Here, applying the sending or not sending TF QKD protocol, we experime…

quant-ph2019★ 47 cited

Symmetry-protected privacy: beating the rate-distance linear bound over a noisy channel

Pei Zeng, Weijie Wu, Xiongfeng Ma

There are two main factors limiting the performance of quantum key distribution --- channel transmission loss and noise. Previously, a linear bound was believed to put an upper lim…

quant-ph2019★ 1 cited

An entanglement-based quantum network based on symmetric dispersive optics quantum key distribution

Xu Liu, Xin Yao, Rong Xue +9

Quantum key distribution (QKD) is a crucial technology for information security in the future. Developing simple and efficient ways to establish QKD among multiple users are import…

quant-ph2019★ 130 cited

Experimental implementation of universal nonadiabatic geometric quantum gates in a superconducting circuit

Yuan Xu, Ziyue Hua, Tao Chen +9

Using geometric phases to realize noise-resilient quantum computing is an important method to enhance the control fidelity. In this work, we experimentally realize a universal nona…

quant-ph2019★ 13 cited

Entanglement-breaking superchannels

Senrui Chen, Eric Chitambar

In this paper we initiate the study of entanglement-breaking (EB) superchannels. These are processes that always yield separable maps when acting on one side of a bipartite complet…

quant-ph2019★ 29 cited

Quantum information processing with closely-spaced diamond color centers in strain and magnetic fields

Zhujing Xu, Zhang-qi Yin, Qinkai Han +1

Electron and nuclear spins of diamond nitrogen-vacancy (NV) centers are good candidates for quantum information processing as they have long coherence time and can be initialized a…

quant-ph2019★ 12 cited

Topological Dynamical Decoupling

Jiang Zhang, Xiao-Dong Yu, Gui-Lu Long +1

We show that topological equivalence classes of circles in a two-dimensional square lattice can be used to design dynamical decoupling procedures to protect qubits attached on the…

quant-ph2019★ 113 cited

Error-transparent operations on a logical qubit protected by quantum error correction

Y. Ma, Y. Xu, X. Mu +8

Universal quantum computation is striking for its unprecedented capability in processing information, but its scalability is challenging in practice because of the inevitable envir…

quant-ph2019★ 32 cited

Quantum Communication between Multiplexed Atomic Quantum Memories

Chang Li, Nan Jiang, Yukai Wu +4

The use of multiplexed atomic quantum memories (MAQM) can significantly enhance the efficiency to establish entanglement in a quantum network. In the previous experiments, individu…

quant-ph2019★ 52 cited

Robust Quantum Control in Games: an Adversarial Learning Approach

Xiaozhen Ge, Haijin Ding, Herschel Rabitz +1

High-precision operation of quantum computing systems must be robust to uncertainties and noises in the quantum hardware. In this paper, we show that through a game played between…

quant-ph2019★ 25 cited

Phononic entanglement concentration via optomechanical interactions

Shan-Shan Chen, Hao Zhang, Qing Ai +1

Low dissipation, tunable coupling to other quantum systems, and unique features of phonons in the aspects of propagation, detection and others suggest the applications of quantized…