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Chinese Journal of Quantum Electronics

Quantum deterministic key distribution protocol based on GHZ states entanglement swapping

Zhuansun Shaoshua

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

In order to improve the efficiency of deterministic key distribution,a quantum key distribution scheme based on GHZ states entanglement swapping was proposed.By sharing a pair of GHZ states between communicators,Bob can deduce deterministic key from classic information which was sent by Alice who took entanglement and measurement operation.Compared with other scheme based on GHZ entanglement state,two GHZ states produced by Bob in the proposed scheme and particles are distributed not by Alice,but Bob.Security analysis results show that any eavesdropper can be found in time.The proposed scheme has high distribution efficiency in that all the GHZ states can be used to transmit information except those chosen for checking eavesdroppers,it can reach the distribution efficiency at 60% and simple to operation.

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In order to improve the efficiency of deterministic key distribution,a quantum key distribution scheme based on GHZ states entanglement swapping was proposed.By sharing a pair of GHZ states between communicators,Bob can deduce deterministic key from classic information which was sent by Alice who took entanglement and measurement operation.Compared with other scheme based on GHZ entanglement state,two GHZ states produced by Bob in the proposed scheme and particles are distributed not by Alice,but Bob.Security analysis results show that any eavesdropper can be found in time.The proposed scheme has high distribution efficiency in that all the GHZ states can be used to transmit information except those chosen for checking eavesdroppers,it can reach the distribution efficiency at 60% and simple to operation.
In order to enhance the efficiency of quantum key distribution( QKD),a protocol based on entanglement swapping is proposed. Without classical information exchange or unitary operations,the two communication parts can securely share a session key by entanglement swapping and Bell measurement. Almost all qubits,except a few which are used to check the security of quantum channel,can produce the private key,and two pairs of entangled particles can generate two bits private key. The protocol is proved to secure using Stinespring Dilation Theorem and the efficiency analysis is presented.
We present a deterministic secure direct communication scheme via entanglement swapping, where a set of ordered maximally entangled three-particle states (GHZ states), initially shared by three spatially separated parties, Alice, Bob and Charlie, functions as a quantum information channel. After ensuring the safety of the quantum channel, Alice and Bob apply a series local operations on their respective particles according to the tripartite stipulation and the secret message they both want to send to Charlie. By three Alice, Bob and Charlie's Bell measurement results, Charlie is able to infer the secret messages directly. The secret messages are faithfully transmitted from Alice and Bob to Charlie via initially shared pairs of GHZ states without revealing any information to a potential eavesdropper. Since there is not a transmission of the qubits carrying the secret message between any two of them in the public channel, it is completely secure for direct secret communication if perfect quantum channel is used.
In order to improve the efficiency of key distribution,a quantum key distribution protocol based on W state and Bell state entanglement was proposed via quantum dense coding.In the scheme,the sender Alice codes the key successfully via local unitary operations,and the receiver Bob obtains the key with jointing measurement.All states can be used to transmit messages except those choosen for checking eavesdroppers,5 bits deterministic key were distributed by 5 particles.Security analysis result by using information theory shows that the scheme is secure,any eavesdroppers can be found in time.
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.