Two-stage quantum state cooperative multicast method based on butterfly network structure

Abstract

The invention discloses a two-stage quantum state cooperative multicast method based on a butterfly network structure, which belongs to the field of multi-party quantum secret communication. The two-stage quantum state cooperative multicast method comprises the following steps: two source nodes in a sender are measured by using particles with entangled states to obtain a measurement result and anentangled state particle collapse state; the intermediate node C1 corrects the coefficient subscripts of the collapsed state of the entangled state particles by using the measurement result to obtaina corrected state; the source node sends the correction state to a target node through a side channel; the intermediate node C1 sends the measurement result to an intermediate node C2 through a bottleneck channel, and the intermediate node C2 generates a classic bit by using the measurement result and sends the classic bit to a target node; the target node performs unitary operation on a correction state by using the classic bit, so that the target node has the same quantum state, and cooperative multicast of two stages of quantum states is completed; the two target nodes in the butterfly network can obtain the same quantum state with a determined probability.

Description

technical field [0001] The invention relates to the technical field of multi-party quantum secure communication, in particular to a two-level quantum state cooperative multicast method based on a butterfly network structure. Background technique [0002] With the rapid development of society, communication services are becoming more and more frequent. Although the research on quantum secure communication technology between two parties is relatively mature, it is difficult for point-to-point two-party communication to meet the actual needs of large-scale quantum network communication. There are mainly two Disadvantages: First, if the communication between multiple parties still adopts two-party communication, it will increase communication costs and reduce communication efficiency; second, in two-party communication, although the sender does not own the target quantum state, he knows all of the target quantum states Information, making the information of the target quantum st...

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Problems solved by technology

[0005] The purpose of the present invention is: the present invention provides a two-level quantum state cooperative multicast method based on the butterfly network structure, which solves the problem that in the current cooperative multicast field, it is impossible to realize the cooperative transmission of quantum information by each node in a specific network , and the technical problem of simultaneously sending quantum information from multiple source nodes to multiple target nodes

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