Abstract
A kind of novel three-party quantum secure direct communication protocol is proposed with the correlation of two-particle entangled state. In this scheme the qubit transmission forms a closed loop and every one of the three participants is both a receiver and a sender of particle sequences in the bidirectional quantum channels. Each party implements the corresponding unitary operations according to its secret bit value over the quantum channels and then extracts the other two parties’ unitary operations by performing Bell measurements on the encoded particles. Thus they can obtain the secret information simultaneously. Finally, the security analysis shows that the present three-party scheme is a secure protocol.
Highlights
Quantum key distribution (QKD) is based on quantum mechanics and has the unconditional security, in which all legitimate users can distribute a shared key beforehand to make secure communications
The transmission of secret messages is unidirectional in quantum secure direct communication (QSDC)
Jin et al [7] proposed a three-party quantum secure direct communication based on the GHZ states, which was improved by Man et al [8]
Summary
Quantum key distribution (QKD) is based on quantum mechanics and has the unconditional security, in which all legitimate users can distribute a shared key beforehand to make secure communications. (2014) Three-Party Simultaneous Quantum Secure Communication Based on Closed Transmission Loops. Boström and Felbinger [3] proposed a deterministic secure direct communication scheme named “ping-pong” protocol based on two-photon entangled states, which was improved by Li et al [4]. Jin et al [7] proposed a three-party quantum secure direct communication based on the GHZ states, which was improved by Man et al [8]. Wang et al [9] proposed a three-party QSDC scheme with EPR pairs, and their protocol was improved on the quantum channels and the efficiency by Chong et al [10]. We propose a novel three-party QSDC protocol by using the idea of quantum dense coding on the two-particle EPR pair.
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