关键词: 逻辑单粒子, 酉算符, 多方量子密钥协商, 集体噪声, 参与者攻击

Abstract: The influence of collective noise on quantum cryptographic protocols can not be ignored, but there are few multiparty quantum key agreement protocols that can resist collective noise.In order to resist the influence of collective dephasing noise and collective rotation noise, two sets of logical unitary operators are proposed respectively. When they are applied to logical single particle, two unitary operators do not change the measurement base, while the other two change the measurement base. Based on this property, a multiparty quantum key agreement protocol is proposed. Security analysis shows that the protocol can resist interception retransmission attack, entanglement measurement attack and participant attack; Efficiency analysis shows that the protocol achieve higher qubit efficiency.

Key words: logical single particle, unitary operators, multiparty quantum key agreement, collective noise, participant attack