基于纠缠交换的量子密钥分发

为了提高量子密钥分发的效率,提出了一种基于纠缠交换的密钥分配方案。该方案无需交换经典信息且不要进行任何酉操作,通信双方通过纠缠交换并利用贝尔测量即可生成密钥;除去少量用于检测量子信道安全的量子位,其余量子位都可以用来生成密钥,且每两对纠缠粒子就可以生成密钥的两个比特位。利用Stinespring Dilation定理证明了该方案的安全性并给出了效率分析。

Quantum key distribution based on entanglement swapping

In order to enhance the efficiency of quantum key distribution (QKD), a protocol based on entanglement swapping is proposed. Without classical information exchange or unitary operations, the two communication parts can securely share a session key by entanglement swapping and Bell measurement. Almost all qubits, except a few which are used to check the security of quantum channel, can produce the private key, and two pairs of entangled particles can generate two bits private key. The protocol is proved to secure using Stinespring Dilation Theorem and the efficiency analysis is presented.