Efficient Controlled Bidirectional Quantum Secure Direct Communication using entanglement swapping in a network
This work addresses secure communication in quantum networks, offering an incremental improvement in efficiency for controlled bidirectional protocols.
The paper tackles the problem of enabling two users to securely and simultaneously transmit secret messages under a controller's supervision, achieving higher efficiency with the lowest number of quantum resources and security checking steps.
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.