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Communications in Theoretical Physics

A Protocol for Bidirectional Quantum Secure Communication Based on Genuine Four-Particle Entangled States

Gan Gao, Wang Li-Ping

Published Sep 1, 2010• 21 citations
Publisher

Abstract

By swapping the entanglement of genuine four-particle entangled states, we propose a bidirectional quantum secure communication protocol. The biggest merit of this protocol is that the information leakage does not exist. In addition, the ideas of the “two-step" transmission and the block transmission are employed in this protocol. In order to analyze the security of the second sequence transmission, decoy states are used.

DOI
10.1088/0253-6102/54/3/13

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By swapping the entanglement of genuine four-particle entangled states, we propose a bidirectional quantum secure communication protocol. The biggest merit of this protocol is that the information leakage does not exist. In addition, the ideas of the “two-step" transmission and the block transmission are employed in this protocol. In order to analyze the security of the second sequence transmission, decoy states are used.
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A multiparty bidirectional quantum secure communication protocol is proposed with two-photon entanglement and quantum dense coding, in which the qubit transmission forms a closed loop.In this scheme, each user performs the unitary operations according to his secret information to encode the exchanged messages into the particle sequences.Then, each participant can extract the other participants' secret messages by implementing Bell measurements on the encoded particles.Thus all the users realize the direct communication simultaneously.Finally, the security analysis shows that our scheme is secure.
A quantum secure direct communication scheme using dense coding is proposed. At first, the sender (Alice) prepares four-particle genuine entangled states and shares them with the receiver (Bob) by sending two particles in each entangled state to him. Secondly, Alice encodes secret information by performing the unitary transformations on her particles and transmits them to Bob. Finally, Bob performs the joint measurements on his particles to decode the secret information. The two-step security test guarantees the security of communication.
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.