In this paper, a continuous variable B92 quantum key distribution protocol is proposed using single photon added and subtracted coherent states, which are prepared by adding and subsequently subtracting a single photon on a coherent state. It is established that in contrast to the traditional discrete variable B92 protocol, this protocol for quantum key distribution is intrinsically robust against the unambiguous state discrimination attack, which circumvents the requirement for any uninformative states or entanglement used in corresponding discrete variable case as a remedy for this attack. Further, it is shown that the proposed protocol is intrinsically robust against the eavesdropping strategies exploiting classical communication during basis reconciliation, such as beam splitter attack. Security against some individual attacks, key rate, and bit-error rate estimation for the proposed scheme are also provided. Specifically, the proposed scheme ensures very small bit-error rate due to properties of the states used. Thus, the proposed scheme is shown to be preferable over the corresponding discrete variable B92 protocol as well as some similar continuous variable quantum key distribution schemes.

本文提出了一种使用单光子相加态和相干态相干态的连续变量B92量子密钥分配协议，该协议是通过在相干态上相加和相减一个光子来准备的。可以确定的是，与传统的离散变量B92协议相比，该用于量子密钥分发的协议本质上具有针对明确状态歧视攻击的鲁棒性，该攻击避免了在相应离散变量情况下使用任何无信息状态或纠缠的要求，以作为补救措施。这次袭击。此外，还表明，所提出的协议本质上对在基础和解期间利用经典通信的窃听策略（例如，分束器攻击）具有鲁棒性。防范某些个人攻击，密钥率，还提供了所提出方案的误码率估计。具体地，由于所使用的状态的特性，所提出的方案确保了非常小的误码率。因此，所提出的方案显示出优于相应的离散变量B92协议以及一些类似的连续变量量子密钥分配方案。