Efficient Multiparty Quantum Key Agreement Using Block-Based Single Particles

High efficiency and good security are two crucial factors to evaluate multiparty quantum key agreement (MQKA) protocols. An efficient MQKA protocol is put forward and characterized by block and complete-graph travelling mode. It employs combined strategies of mutually unbiased bases, asynchronous actions, delay-wait, random sorting and comparison. The detailed analysis shows that it can well defend outside attacks and participant attacks. In contrast to typical existing MQKA protocols, its overall performance about security and efficiency is preferable. Moreover, it is feasibly implemented by current technologies as its information carriers are single particles.