Sending-or-not-sending quantum key distribution with phase postselection
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. With this modification, the probability of selecting ``sending'' can be substantially improved. The numerical simulation shows that the transmission distance can be improved both with and without the actively odd-parity pairing method. The case of discrete phase randomization is also analyzed, a similar improvement on distance can be seen.
Authors
- Yang-Guang Shan (ORCID: https://orcid.org/0000-0002-9013-7507)
- Guang‐Can Guo (ORCID: https://orcid.org/0000-0003-3771-9185)
- Yao Zhou (ORCID: https://orcid.org/0000-0001-6030-9104)
- De‐Yong He (ORCID: https://orcid.org/0000-0002-4183-6950)
- Zhen−Qiang Yin (ORCID: https://orcid.org/0000-0002-3486-3934)
- Zheng-Fu Han
- Wei Chen (ORCID: https://orcid.org/0000-0003-1789-789X)
- Shuang Wang (ORCID: https://orcid.org/0000-0003-1822-1613)
Institutions
- University of Science and Technology of China (CN)
Publication Details
- Journal
- Physical Review Applied
- Published
- 2024-08-21
- DOI
- https://doi.org/10.1103/physrevapplied.22.024056
- Citations
- 2
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 0.69
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Natural Science Foundation of Anhui Province
- National Key Research and Development Program of China