基于重复码的可验证多方量子密钥分发协议
A verifiable multi-party quantum key distribution protocol based on repetitive codes
摘要：
本文首次设计了一种基于重复码的多方量子密钥分发协议。首先，我们建立了一个经典的（t，n）门限协议，该协议可以认证参与者的身份，并根据这个重复码对经典的密钥序列进行编码。然后利用该（t，n）门限协议的参数对该编码序列所对应的量子态序列进行幺正变换。此外，我们推导出两个阈值是否保留的测量值的接收序列，并提取经典的子密钥序列从测量值符合这两个阈值条件。该协议能够认证参与者的身份，抵抗来自内部和外部参与者的攻击，并且在测试窃听者时不需要诱饵态粒子，比同类协议效率更高，同时也节省了量子资源。
英文摘要：
A multi-party quantum key distribution protocol based on repetitive code is designed for the first time in this paper. First we establish a classical (t, n) threshold protocol which can authenticate the identity of the participants, and encode the classical key sequence in accordance with this repetitive code. Then unitary transformation of the quantum state sequence corresponding to this encoded sequence is carried out by using the parameters from this (t, n) threshold protocol. Furthermore, we derive two thresholds for whether or not reserving the measured values of the received sequence, and extract the classical subkey sequence from the measured values conforming to these two threshold conditions. This protocol can authenticate the identity of the participant, resist the attack from the internal and external participants, and do not need the decoy state particles when testing the eavesdropper, which is more efficient than the similar protocols, and also saves the quantum resources.
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