Quantum key distribution using single photon added-subtracted squeezed coherent state

TL;DR

This paper explores the security of a novel quantum key distribution protocol using a non-Gaussian, nonclassical state called SPASSCS, demonstrating its robustness and efficiency over traditional states against eavesdropping.

Contribution

It introduces the use of single photon added-subtracted squeezed coherent states in CV-QKD, showing their enhanced security and performance compared to existing states.

Findings

SPASSCS is non-Gaussian and nonclassical, as shown by the Wigner function.

The proposed state is robust against intercept-resend and superior channel attacks.

It outperforms coherent, squeezed coherent, and photon added-subtracted coherent states in key distribution.

Abstract

In this paper we investigate the security of continuous variable BB84 quantum key distribution protocol using single photon added then subtracted squeezed coherent state SPASSCS. It's found that the SPASSCS is a non-Gaussian and nonclassical state. Its non-Gaussianity and non-classicality are exhibited via the Wigner function. It's shown that the proposed state is generally robust against the eavesdropping strategies, such as intercept-resend attack and superior channel attack. Further, a comparative study has proved the strong efficiency of the proposed state over coherent state, squeezed coherent state and photon added then subtracted coherent state. Our analysis employs bit error rate, mutual information, and secure key gain.