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Practical quantum contract signing without quantum storage

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Abstract

In many occasions, it is inevitable to sign a contract, which can be easily realized in a face-to-face way. However, how to sign a contract in asynchronous network while guaranteeing each party’s fairness is a difficult problem. In this work, we present a practical quantum contract signing protocol, which keeps the previous work’s advantages such as fairness, low communication complexity and independence with the current signing technology. Furthermore, it is based on single particles but not entangled states. More importantly, it removes the requirement of long-time quantum storage which is difficult to be realized with current technology. Therefore, this protocol is more easily to be realized in practice.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 62172196, 61976024, 61972048, 61602232, 61902166), the Guangxi Key Laboratory of Trusted Software (Grant No. KX202040), the Postgraduate Education Reform Project of Henan Province (Grant No.2019-SJGLX094Y), the Key Scientific Research Project in Universities of Henan Province (Grant No. 21A110017), the Natural Science Foundation of Henan Province (Grant No. 212300410062) and the Youth Key Teacher Project of Luoyang Normal University.

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Authors and Affiliations

  1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Xiao-Qiu Cai, Chun-Yan Wei & Fei Gao

  2. School of Mathematical Science, Luoyang Normal University, Luoyang, 471934, China

    Xiao-Qiu Cai, Tian-Yin Wang & Chun-Yan Wei

  3. Guangxi Key Laboratory of Trusted Software, Guilin University of Electronic Technology, Guilin, 541004, China

    Xiao-Qiu Cai, Tian-Yin Wang & Chun-Yan Wei

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  1. Xiao-Qiu Cai
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  2. Tian-Yin Wang
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  3. Chun-Yan Wei
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  4. Fei Gao
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Correspondence to Tian-Yin Wang.

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Cai, XQ., Wang, TY., Wei, CY. et al. Practical quantum contract signing without quantum storage. Quantum Inf Process 21, 58 (2022). https://doi.org/10.1007/s11128-021-03406-4

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