Yang-Guang Shan

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.