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

Continuous variable B92 quantum key distribution protocol using single photon added and subtracted coherent states