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Multiparty quantum key agreement protocol based on logical single particle
Shengwei XU, Jie KANG
Journal of Computer Applications    2022, 42 (1): 157-161.   DOI: 10.11772/j.issn.1001-9081.2021010176
Abstract258)   HTML6)    PDF (456KB)(57)       Save

The influence of collective noise on quantum cryptographic protocols can not be ignored, however there are few Multiparty Quantum Key Agreement (MQKA) protocols that can resist collective noise. In order to resist the influence of collective noise, two sets of logical unitary operators were proposed for the logical single particle which can resist collective-dephasing noise and the logical single particle which can resist collective rotation noise respectively, so that after acting them on the logical single particles, two unitary operators did not change the measurement base, while the other two would change the measurement base. Based on this property, an MQKA protocol was proposed. Firstly, a logical single particle was transmited to the next participant by each participant.Then, the logical single particle was encrypted by all other participants and returned to the participant to form a “ring”. Finally, the shared key was obtained by measurement. Security analysis shows that the proposed protocol can resist intercept-resend attack, entanglement-measurement attack and participant attack. Efficiency analysis shows that this protocol achieves higher qubit efficiency.

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