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Journal of Xidian University

Multi-user quantum key distribution model and the correlative protocol

Min Nie

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

We propose a Multi-user Quantum Key Distribution(MQKD) protocol,which only needs n quantum channels for a communication system of n users to realize the protocol with entangled states and entanglement swapping.By the quantum mediator,any two among n users of the system can communicate with each other,even though there is no direct quantum channel between them.Based on the traffic theory,we present a relationship formula of the number of user n and the number of Bell state measurement units m.Because entanglement swapping entangles the quantum states of the two users,the quantum mediator has no way to fraudulently intervene in or eavesdrop on the communication.

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We propose a Multi-user Quantum Key Distribution(MQKD) protocol,which only needs n quantum channels for a communication system of n users to realize the protocol with entangled states and entanglement swapping.By the quantum mediator,any two among n users of the system can communicate with each other,even though there is no direct quantum channel between them.Based on the traffic theory,we present a relationship formula of the number of user n and the number of Bell state measurement units m.Because entanglement swapping entangles the quantum states of the two users,the quantum mediator has no way to fraudulently intervene in or eavesdrop on the communication.
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In order to improve the security and efficiency of quantum key distribution protocol,a protocol was proposed based on entanglement swapping.The two parties of communication establish the key by performing the Bell state measurement.No other people can get the key without being found.Different from the proposed protocol,the Bell measurement of any two Bell states can be realized to achieve the purpose of quantum key distribution.It does not need multi-particle entangled state but only EPR pair to realize the protocol.Analysis results showed that this protocol not only ensures the security of the quantum key shared information,but also uses the entanglement states of two photons without unitary operation. And the protocol is simple and efficient.
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