Showing 2021 · quant-phShow all

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quant-ph2021★ 39 cited

Significant-loophole-free test of Kochen-Specker contextuality using two species of atomic-ions

Pengfei Wang, Junhua Zhang, Chun-Yang Luan +7

Quantum measurements cannot be thought of as revealing preexisting results, even when they do not disturb any other measurement in the same trial. This feature is called contextual…

quant-ph2021★ 5 cited

Room-temperature on-chip generation of heralded single photons with switchable orbital angular momentum

Shan Zhang, Xue Feng, Wei Zhang +3

In quantum optics, orbital angular momentum (OAM) is very promising to achieve high-dimensional quantum states due to the nature of infinite and discrete eigenvalue, which is quant…

quant-ph2021★ 16 cited

Optomechanical Anti-lasing with Infinite Group Delay at a Phase Singularity

Yulong Liu, Qichun Liu, Shuaipeng Wang +3

Singularities that symbolize abrupt changes and exhibit extraordinary behavior are of broad interest. We experimentally study optomechanically induced singularities in a compound s…

quant-ph2021★ 27 cited

Quantum-enhanced rubidium atomic magnetometer based on Faraday rotation via 795-nm Stokes operator squeezed light

Lele Bai, Xin Wen, Yulin Yang +4

With the help of Stokes operator S2 squeezed state (also called polarization squeezed state (PSS)) of 795-nm light, rubidium-87 (87Rb) atomic magnetometer based on Faraday rotation…

quant-ph2021★ 77 cited

Quantum secure direct communication with private dense coding using general preshared quantum state

Jiawei Wu, Gui-Lu Long, Masahito Hayashi

We study quantum secure direct communication by using a general preshared quantum state and a generalization of dense coding. In this scenario, Alice is allowed to apply a unitary…

quant-ph2021★ 8 cited

A full circuit-based quantum algorithm for excited-states in quantum chemistry

Jingwei Wen, Zhengan Wang, Chitong Chen +7

Utilizing quantum computer to investigate quantum chemistry is an important research field nowadays. In addition to the ground-state problems that have been widely studied, the det…

quant-ph2021★ 16 cited

Robust twin-field quantum key distribution through sending-or-not-sending

Cong Jiang, Zong-Wen Yu, Xiao-Long Hu +1

The sending-or-not-sending (SNS) protocol is one of the most major variants of the twin-field (TF) quantum key distribution (QKD) protocol and has been realized in a 511 km field f…

quant-ph2021★ 16 cited

Variational Quantum-Neural Hybrid Error Mitigation

Shi-Xin Zhang, Zhou-Quan Wan, Chang-Yu Hsieh +2

Quantum error mitigation (QEM) is crucial for obtaining reliable results on quantum computers by suppressing quantum noise with moderate resources. It is a key factor for successfu…

quant-ph2021★ 14 cited

Incompatibility as a resource for programmable quantum instruments

Kaiyuan Ji, Eric Chitambar

Quantum instruments represent the most general type of quantum measurement, as they incorporate processes with both classical and quantum outputs. In many scenarios, it may be desi…

quant-ph2021★ 63 cited

A flying Schrödinger cat in multipartite entangled states

Zhiling Wang, Zenghui Bao, Yukai Wu +11

Schrödinger's cat originates from the famous thought experiment querying the counterintuitive quantum superposition of macroscopic objects. As a natural extension, several "cats" (…

quant-ph2021★ 12 cited

Experimental demonstration of adversarial examples in learning topological phases

Huili Zhang, Si Jiang, Xin Wang +7

Classification and identification of different phases and the transitions between them is a central task in condensed matter physics. Machine learning, which has achieved dramatic…

quant-ph2021★ 119 cited

Closing the "Quantum Supremacy" Gap: Achieving Real-Time Simulation of a Random Quantum Circuit Using a New Sunway Supercomputer

Yong, Liu, Xin +13

We develop a high-performance tensor-based simulator for random quantum circuits(RQCs) on the new Sunway supercomputer. Our major innovations include: (1) a near-optimal slicing sc…

quant-ph2021★ 12 cited

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Lele Bai, Lulu Zhang, Yongbiao Yang +5

We measured the spin noise spectroscopy (SNS) of rubidium atomic ensemble with two different atomic vapor cells (filled with the buffer gases or coated with paraffin film on the in…

quant-ph2021★ 12 cited

Classical-to-quantum transition in multimode nonlinear systems with strong photon-photon coupling

Yue-Xun Huang, Ming Li, Ke Lin +3

With advanced micro- and nano-photonic structures, the vacuum photon-photon coupling rate is anticipated to approach the intrinsic loss rate and lead to unconventional quantum effe…

quant-ph2021★ 6 cited

Device-Independent-Quantum-Randomness-Enhanced Zero-Knowledge Proof

Cheng-Long Li, Kai-Yi Zhang, Xingjian Zhang +15

Zero-knowledge proof (ZKP) is a fundamental cryptographic primitive that allows a prover to convince a verifier of the validity of a statement without leaking any further informati…

quant-ph2021★ 35 cited

On-Demand Storage and Retrieval of Microwave Photons Using a Superconducting Multiresonator Quantum Memory

Zenghui Bao, Zhiling Wang, Yukai Wu +5

A quantum memory that can store quantum states faithfully and retrieve them on demand has wide applications in quantum information science. An efficient quantum memory in the micro…

quant-ph2021★ 35 cited

Arbitrary entangled state transfer via a topological qubit chain

Chong Wang, Linhu Li, Jiangbin Gong +1

Quantum state transfer is one of the basic tasks in quantum information processing. We here propose a theoretical approach to realize arbitrary entangled state transfer through a q…

quant-ph2021★ 2 cited

Weighted Quantum Channel Compiling through Proximal Policy Optimization

Weiyuan Gong, Si Jiang, Dong-Ling Deng

We propose a general and systematic strategy to compile arbitrary quantum channels without using ancillary qubits, based on proximal policy optimization -- a powerful deep reinforc…

quant-ph2021★ 11 cited

Stream privacy amplification for quantum cryptography

Yizhi Huang, Xingjian Zhang, Xiongfeng Ma

Privacy amplification is the key step to guarantee the security of quantum communication. The existing security proofs require accumulating a large number of raw key bits for priva…

quant-ph2021★ 34 cited

Probing many-body localization by excited-state VQE

Shuo Liu, Shi-Xin Zhang, Chang-Yu Hsieh +2

Non-equilibrium physics including many-body localization (MBL) has attracted increasing attentions, but theoretical approaches of reliably studying non-equilibrium properties remai…

quant-ph2021★ 7 cited

Quantum error correction meets continuous symmetries: fundamental trade-offs and case studies

Zi-Wen Liu, Sisi Zhou

We systematically study the fundamental competition between quantum error correction (QEC) and continuous symmetries, two key notions in quantum information and physics, in a quant…

quant-ph2021★ 18 cited

Approximate symmetries and quantum error correction

Zi-Wen Liu, Sisi Zhou

Quantum error correction (QEC) is a key concept in quantum computation as well as many areas of physics. There are fundamental tensions between continuous symmetries and QEC. One v…

quant-ph2021★ 5 cited

Improved superconducting qubit state readout by path interference

Zhiling Wang, Zenghui Bao, Yukai Wu +6

High fidelity single shot qubit state readout is essential for many quantum information processing protocols. In superconducting quantum circuit, the qubit state is usually determi…

quant-ph2021★ 105 cited

Quantum key distribution over 658 km fiber with distributed vibration sensing

Jiu-Peng Chen, Chi Zhang, Yang Liu +11

Twin-field quantum key distribution (TF-QKD) promises ultra-long secure key distribution which surpasses the rate distance limit and can reduce the number of the trusted nodes in l…