Efficient Controlled Bidirectional Quantum Secure Direct Communication using entanglement swapping in a network

TL;DR

This paper introduces an efficient controlled bidirectional quantum secure direct communication protocol leveraging entanglement swapping, enhancing security and resource efficiency in quantum networks.

Contribution

It proposes a novel CBQSDC protocol using entanglement swapping, reducing quantum resources and security checks, with a generalization for network implementation.

Findings

Uses fewer quantum resources (EPR pairs)

Reduces security checking steps

Enables simultaneous bidirectional communication

Abstract

In this paper, a novel controlled bidirectional quantum secure direct communication protocol (CBQSDC) is proposed. In this scheme, both users can transmit their secret messages directly and simultaneously under the permission of the controller. The proposed method use feature of entanglement swapping which is led to more efficiency (lowest number of quantum resources (EPR pairs)), security and the lowest number of security checking steps. Also, a generalization of the protocol is explained and a protocol of CBQSDC-based network is presented.