We investigate the security of continuous-variable BB84 quantum key distribution protocol using a single-photon added and then subtracted squeezed coherent state (SPASSCS). We find that the SPASSCS is a non-Gaussian and nonclassical state; its non-Gaussianity and nonclassicality are exhibited through the Wigner function. We show that the proposed state is generally robust against the eavesdropping strategies, such as intercept-resend attack and superior channel attack. Further, a comparative study proves the strong efficiency of the proposed state over the coherent state, squeezed coherent state and photon-added then subtracted coherent state. In our analysis, we employ bit error rate, mutual information, and secure key gain.
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Oulouda, Y., El Falaki, M. & Daoud, M. Quantum Key Distribution Using a Single-Photon Added–Subtracted Squeezed Coherent State. J Russ Laser Res 44, 13–24 (2023). https://doi.org/10.1007/s10946-023-10103-3
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DOI: https://doi.org/10.1007/s10946-023-10103-3