基于三对Bell态纠缠交换的QDKD方案

摘要

A quantum deterministic key distribution is proposed based on three pair of Bell state entanglement swapping. Three pairs Bell state are entangled and measured by Bell measurement, information about deterministic key is transmitted via classic channel,any eavesdropper could be found in time. Compared with QDKD based on two pair of Bell state entanglement swapping,three pairs Bell state are used and two ways are designed to distribute deterministic key. Analysis results showed that only entanglement state of two particles is used and any unitary operation isn’t involved,it’s simple to operate and has high distribution efficiency.%提出了一种基于三对Bell态纠缠交换的量子确定性密钥分发方案（Quantum Deterministic Key Distribu-tion，QDKD），该方案充分利用量子纠缠交换的原理，通过对三对Bell态进行纠缠、测量操作，并辅以经典信息实现确定性密钥的分发，方案中任何窃听行为都会被及时发现。同基于两对Bell态纠缠交换的QDKD方案相比，协议利用三对Bell态并使用两种方法实现确定性密钥信息的分发。分析结果表明，方案仅用到两粒子纠缠态，没有涉及任何幺正操作，操作性强，密钥分发效率高。