Zhen-Qiang Yin

Aug 21, 2024 | link.aps.org | Yang-Guang Shan |Yao Zhou |Zhen-Qiang Yin |Shuang Wang

Quantum key distribution (QKD) could help to share a secure key between two distant peers. In recent years, twin-field (TF) QKD has been widely investigated because of its long transmission distance. One of the popular variants of TF QKD is sending-or-not-sending (SNS) QKD, which has been experimentally verified to realize 1000-km level fiber key distribution. In this article, we introduce phase postselection into the SNS protocol.

Jul 22, 2024 | link.aps.org | Yang-Guang Shan |Yao Zhou |Zhen-Qiang Yin |Shuang Wang

Twin-field (TF) quantum key distribution (QKD) has been extensively researched because of its long transmission distance. The phase-encoding TF-QKD can realize both a high key rate and a long transmission distance, so it has attracted a lot of attention. In this article, we are inspired by the sending-or-not-sending TF-QKD, in which the information leakages of correct rounds and erroneous rounds are calculated separately.

Feb 12, 2024 | link.aps.org | Yao Zhou |Zhen-Qiang Yin |Yang-Guang Shan |Ze-Hao Wang

Quantum key distribution (QKD) stands as a pioneering method for establishing information-theoretically secure communication channels by utilizing the principles of quantum mechanics. In the security proof of QKD, the phase error rate serves as a critical indicator of information leakage and directly influences the security of the shared key bits between communicating parties, Alice and Bob.

Jan 19, 2024 | link.aps.org | Yao Zhou |Chun-mei Zhang |Zhen-Qiang Yin |Rui-Qiang Wang

Yao Zhou1,3, Rui-Qiang Wang1,3, Chun-Mei Zhang2,*, Zhen-Qiang Yin1,3,4,†, Ze-Hao Wang1,3, Shuang Wang1,3,4, Wei Chen1,3,4, Guang-Can Guo1,3,4, and Zheng-Fu Han1,3,4 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China 2Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, People’s Republic of China 3CAS Center for Excellence in Quantum Information and Quantum...

Mar 31, 2023 | link.aps.org | Yao Zhou |Zhen-Qiang Yin |Shuang Wang |Wei Chen

Abstract Twin-field quantum key distribution (TF-QKD) and its variants provide a promising solution for sharing information-theoretic secure keys between intercity peers since they are able to overcome the fundamental rate-transmittance bound without quantum repeaters.