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Beijing Youdian Xueyuan xuebao

A Ring Quantum Secret Sharing Protocol Based on Entanglement Swapping of Bell States

Qin Su-juan

Published Jan 1, 2006• 2 citations
OpenAlex

Abstract

To simplify the implementation of quantum secret sharing,a protocol based on Bell states entanglement swapping was proposed.The quantum channels among all players constituted a ring.Through adding or deleting nodes in the ring,protocols for any number of players could be designed.Investigation shows that the protocol is secure against the eavesdropping not only by eavesdroppers but also by the players.

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To simplify the implementation of quantum secret sharing,a protocol based on Bell states entanglement swapping was proposed.The quantum channels among all players constituted a ring.Through adding or deleting nodes in the ring,protocols for any number of players could be designed.Investigation shows that the protocol is secure against the eavesdropping not only by eavesdroppers but also by the players.
To improve the efficiency of quantum secret sharing, a protocol share the message directly among the users was proposed. The scheme made full use of entanglement swapping of Bell states and local operations. For detection of eavesdropping, the EPR pairs were divided into two parts: the checking parts and the encoding parts. After insuring the security of the quantum channel by measuring the checking particles in conjugate bases, the sender encoded her bits via the local unitary operations on the encoding parts. Investigation shows that the protocol is secure and two Bell states can be used to share two bits message.
The insecurity of the protocols for quantum secret sharing(QSS) based on entanglement swapping was analyzed,and a new method of QSS based on entanglement swapping was proposed.The entanglement states were all generated by the sender,and the order of two photons sent to the same agent was randomly changed.After the photons arrived at the receiver,for the detection mode,the order of the two photons was announced,so that the two parties detected the security of the quantum channel;for the information mode,the two receivers respectively did Bell measurement on the two photons they owned,and then communicated through classical channel to share the secret key with the sender.Analysis results show that this protocol not only ensures the validity and security of the shared information,but also only uses the entanglement states of two photons without unitary operation.
A multiparty quantum secret sharing (QSS) protocol of classical messages (i.e., classical bits) is proposed by using swapping quantum entanglement of Bell states. The secret messages are imposed on Bell states by local unitary operations. The secret messages are split into several parts, and each part is distributed to a separate party so that no action of a subset of all the parties without the cooperation of the entire group is able to read out the secret messages. In addition, dense coding is used in this protocol to achieve a high efficiency. The security of the present multiparty QSS against eavesdropping has been analyzed and confirmed even in a noisy quantum channel.
Using entanglement swapping, a quantum secret sharing protocol is proposed. After sharing three-EPR among users, for encoding the message, the sender prepares an auxiliary EPR pair and by operating defined Pauli operations, she transmits six-bit message to her two agents. Since using entanglement swapping, no qubits carrying message are transmitted. So, if the perfect quantum channel is used, the protocol is unconditional secure. In addition, this protocol enhances the efficiency of Zhang-Man and Chou et al. protocols and with the comparison of previous works has better performance.
Quantum secret sharing (QSS), an important branch of quantum communication, is the generalization of classical secret sharing into quantum scenario. The secret messages are split into several parts, and each part is distributed to a separate party so that no action of a subset of all the parties without the cooperation of the entire group is able to read out the secret messages. In this paper, a quantum state sharing protocol is proposed by using entanglement swapping and random EPR selection. The EPR pairs of Bell-state measurement are selected randomly by the sender Alice, which can improve the security of the scheme and raise probability of detecting Eve to 95.8%. In addition, difference coding is used in this protocol to achieve a high efficiency. The security of the present multiparty QSS against eavesdropping has been analyzed. It is convenient in application as it require only two qubit entanglements, one measuring-basis and two-qubit joint measurements, not GHZ states, for sharing an arbitrary secret two-qubit state.
To improve the security of quantum cryptography protocol and reduce its cost, this paper presented a new means after analyzing the process of the detection of eavesdropping, and offered a quantum secret sharing protocol to argue for it. Players employed the travel particles carrying secret messages to detect eavesdropping, and leaked nothing about secret messages. Investigation shows that players can make the quantum cryptography protocol not only with theoretic efficiency of 100%, but also secure in case of none checking particles made for detection of eavesdropping only.