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arXiv · 2212.06148

Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing

Chen-Long Li·Yao Fu·Wen-Bo Liu·Yuan-Mei Xie·Bing-Hong Li·Min-Gang Zhou·Hua-Lei Yin·Zeng-Bing Chen
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Abstract

Currently most progresses on quantum secret sharing suffer from rate-distance bound, and thus the key rates are limited. In addition to the limited key rate, the technical difficulty and the corresponding cost together prevent large-scale deployment. Furthermore, the performance of most existing protocols is analyzed in the asymptotic regime without considering participant attacks. Here we report a measurement-device-independent quantum secret sharing protocol with improved key rate and transmission distance. Based on spatial multiplexing, our protocol shows it can break rate-distance bounds over network under at least ten communication parties. Compared with other protocols, our work improves the secret key rate by more than two orders of magnitude and has a longer transmission distance. We analyze the security of our protocol in the composable framework considering participant attacks and evaluate its performance in the finite-size regime. In addition, we investigate applying our protocol to digital signatures where the signature rate is improved more than $10^7$ times compared with existing protocols. We anticipate that our quantum secret sharing protocol will provide a solid future for multiparty applications on the quantum network.

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Chen-Long Li, Yao Fu, Wen-Bo Liu, Yuan-Mei Xie, Bing-Hong Li, Min-Gang Zhou, Hua-Lei Yin, Zeng-Bing Chen. 2023-08-08. Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing. https://doi.org/10.1103/physrevresearch.5.033077

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