2024/07/19 by Qin Liao, Zhuoying Fei, Liao, Qin +5 · 1 citation
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2407.13983
openalex publication_date 2024/07/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Although continuous-variable quantum secret sharing (CVQSS) has been theoretically proven to be secure, it may still be vulnerable to various local oscillator (LO)-aimed attacks. To close this loophole, we propose a practical CVQSS scheme using local LO (LLO), which is called LLO-CVQSS. In this scheme, LO is no longer generated by each user but can be locally generated by the legitimate party, i.e., the dealer. This waives the necessity that all LOs have to be transmitted through an untrusted channel, which makes CVQSS system naturally immune to all LO-aimed attacks, greatly enhancing its practical security. We also develop a specially designed phase compensation method for LLO-CVQSS so that the phase noise of the whole system can be eliminated. We finally construct a noise model for LLO-CVQSS and derive its security bound against both eavesdroppers and dishonest users. Numerical simulation shows that LLO-CVQSS is able to support 30 users at the same time and its maximal transmission distance reaches 112 km, revealing that LLO-CVQSS is not only has the ability to defend itself against all LO-aimed attacks but also has the potential for building large-scale practical quantum communication networks.