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Modern Physics Letters A

Controlled quantum dialogue scheme based on different unspecific two-particle entangled state

Aihan Yin, Weibin Lin, Ping Fan

Published Sep 30, 2019• 7 citations
Publisher

Abstract

In this paper, a controlled quantum dialogue (CQD) scheme based on different unspecific two-particle entangled state is proposed, in which legitimate users can exchange their secret messages according to unitary operations they chose and measurement results published by Charlie, realizing transmitting unspecific secrets by using unspecific entangled state. We insert decoy particles twice and get rid of useless secret messages carried by F particles to ensure security of the whole communication system, realizing the three-times channel detection. Compared to previous CQD protocols, the proposed scheme is proved to stand attack from third-party controller, and it is very secure.

DOI
10.1142/s0217732319503516

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In this paper, a controlled quantum dialogue (CQD) scheme based on different unspecific two-particle entangled state is proposed, in which legitimate users can exchange their secret messages according to unitary operations they chose and measurement results published by Charlie, realizing transmitting unspecific secrets by using unspecific entangled state. We insert decoy particles twice and get rid of useless secret messages carried by F particles to ensure security of the whole communication system, realizing the three-times channel detection. Compared to previous CQD protocols, the proposed scheme is proved to stand attack from third-party controller, and it is very secure.
A novel scheme of controlled secure quantum dialogue by using Brown states was proposed in this paper.It this scheme,Alice,Bob and Charlie shared a five-particle Brown states.Alice made unitary operations on two particles of the Brown states to realize encoding her secret calssical message.Similarly,Bob performed corresponding unitary transformations to another two particles to encode the information that he wanted to send to Alice.Later,Charlie made Brown base states joint measurement on the Brown final state and announced the measured results.Alice and Bob deduced the opposite party′s information according to Charlie′s announced measurement results and her(his)unitary operation when encoding.They completed quantum dialogue successfully.Then the scheme′s security was discussed and a conclusion was drawn.Compared with the previous quantum dialogues,the secure quantum dialogue scheme adds the controlled party,ensures the communication security,and increases the particles number involving in the communication process and the coding efficiency.
In this paper, a controlled quantum dialogue (CQD) protocol based on Brown states is proposed. In the beginning, the controller Cindy creates a five-qubit Brown state as the channel and distributes it to the other two communication participants, Alice and Bob. Then, Alice and Bob can encode the secret key by performing unitary operation onto the entangled particles that Cindy sends to them. Finally, the messages can be exchanged by entanglement swapping and the results of Bell state measurement. The security analysis shows that our protocol cannot only solves the problem of information leakage, but also can effectively prevent a variety of well-known attacks. Under the control of Cindy, there are two possible decoding methods for participants to obtain each other's information, improving communication security. In addition, this protocol does not involve complex quantum operations and demonstrates a good physical operational feasibility.
In this paper, we point out Partially Entangled States quantum dialogue, which enables both legitimate parties to exchange their 2 bit secret messages in a direct way. Two step security check guarantees the security of this protocol. Partially Entangled States used as information carrier are easy to prepare and store, there is no need to transmit quantum states with secret message in quantum channel and two users can simultaneously communicate with the third party. The protocol is secure against the intercept-resend attack and the entangle-measure attack.
A scheme of quantum dialogue was proposed based on four-particle omega state.First,Bob,a communication party,prepared a four-particle omega state,encoded classical secret information by performing an approprite unitary transformation on two particles of the omega state and sent them to Alice.Then,Alice also performed an approprite unitary transformation on the two particles to encode secret information and sent back to Bob.Finally,Bob made joint measurement to final omega state,and announced the results.Alice and Bob,two parties of communication,could decode classical information the opposite one transfers,according to the announced measurement results and itself unitary operator,making the bidirectional communication come true.The result shows that the communication scheme only transfers two particles and makes unitary operations twice,and two communication parties get the opposite four-bit classcical information.It realizes both two-way communication of classical information with quantum channel and dense encoding to improve the communication capacity.The Eve′s intercept-resend attack can be found in time by inserting decoy photons in the system to raise the security of communication system.
In this paper, we point out Partially Entangled States quantum dialogue, which enables both legitimate parties to exchange their 2 bit secret messages in a direct way. Two step security check guarantees the security of this protocol. Partially Entangled States used as information carrier are easy to prepare and store, there is no need to transmit quantum states with secret message in quantum channel and two users can simultaneously communicate with the third party. The protocol is secure against the intercept-resend attack and the entangle-measure attack.