Quantum secure direct communication with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>χ</mml:mi></mml:math>-type entangled states

TLDR

The authors propose a quantum secure direct communication protocol based on χ‑type entangled states. The protocol employs χ‑type entangled states, quantum superdense coding for high intrinsic efficiency and source capacity, and introduces an alternative scheme to secure communication over noisy channels while discussing practical implementation. Security analysis demonstrates that the protocol is secure under ideal conditions.

Abstract

In this paper, a quantum secure direct communication protocol with $\ensuremath{\chi}$-type entangled states ${\ensuremath{\mid}{\ensuremath{\chi}}^{00}⟩}_{3214}$ is proposed. We analyze the security of this protocol and prove that it is secure in ideal conditions. Then, an alternative way is presented to ensure the security of this protocol in a noisy channel. Moreover, this protocol utilizes quantum superdense coding to achieve a high intrinsic efficiency and source capacity. The practical implementation of this protocol is also discussed.