Quantum Bidirectional Secure Direct Communication via Entanglement Swapping
Yan Chen, Man Zhong-Xiao, Yun‐Jie Xia · Chinese Physics Letters · 2007
In light of a quantum secure direct communication (QSDC) scheme using entanglement swapping [Chin. Phys. Lett. 22 (2005) 18], by introducing additional local operations for encoding, we propose a bidirectional QSDC (BQSDC) protocol, in which two legitimate users can simultaneously exchange their respective messages. The rule for the users to retrieve his/her partner's messages is derived explicitly in the most general case. Eve's commonly used attack method has been discussed and can be detected with the security checking process.