Continuous Variable Quantum Secret Sharing with Security Enhancement in Practical Quantum Communications

Yun Mao, Yiwu Zhu, Yijun Wang () and Ying Guo ()
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Yun Mao: School of Information Engineering, Shaoyang University, Shaoyang 422000, China
Yiwu Zhu: School of Automation, Central South University, Changsha 410083, China
Yijun Wang: School of Automation, Central South University, Changsha 410083, China
Ying Guo: School of Automation, Central South University, Changsha 410083, China

Mathematics, 2022, vol. 10, issue 20, 1-9

Abstract: Quantum communications can be conveniently implemented by two participants, but quantum secret key sharing (QSS) through multi-participant communication seems difficult in practice. In this paper, we propose a multi-participant QSS scheme with the local local oscillator (LLO) in continuous variable (CV) quantum communications. It allows an honest participant called a dealer to share a secret key with the others, making it possible to establish a secret key if and only if all participants gather together. The LLO scheme, which eliminates the need for the local oscillator (LO) to be propagated in insecure channels, can be used to avoid the potential LO attack in the traditional CVQSS scheme. Numerical simulation shows that the performance of the LLO-based CVQSS can be improved in terms of the maximal transmission distance even if it is performed with the partially trusted noise.

Keywords: quantum secret sharing; quantum communications; quantum cryptography (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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