Secure direct bidirectional communication protocol using the Einstein-Podolsky-Rosen pair block

TL;DR

This paper introduces a new secure quantum communication protocol enabling two users to simultaneously exchange secret messages using Einstein-Podolsky-Rosen pairs with added local operations for encoding.

Contribution

It presents a novel secure direct communication protocol that improves upon previous methods by allowing bidirectional message exchange with enhanced encoding techniques.

Findings

Protocol ensures secure bidirectional communication

Utilizes Einstein-Podolsky-Rosen pairs with local operations

Enhances security over previous protocols

Abstract

In light of Deng-Long-Liu's two-step secret direct communication protocol using the Einstein-Podolsky-Rosen pair block [Phys. Rev. A {\bf 68}, 042317 (2003)], by introducing additional local operations for encoding, we propose a brand-new secure direct communication protocol, in which two legitimate users can simultaneously transmit their different secret messages to each other in a set of quantum communication device.