Symmetrically parallel controlled bidirectional quantum secure direct communication method

Abstract

The invention discloses a symmetrically parallel controlled bidirectional quantum secure direct communication method in which a multi-particle GHZ state tensor product is used as a quantum channel, a central server is responsible for distributing particles for building the quantum channel and utilizes eavesdropping detection to ensure secure transmission of the particles, two parties of a conversation and control parties use two multi-particle GHZ state tensor products as the quantum channels, and only all the control parties say yes, the two parties of the legal communication can safely exchange respective secret information. According to the method provided by the invention, the parallel controlled conversation method is used, one of all the parties having the GHZ state particles can serve as the party or the control party of the conversation, so that status of all the parties participating in the conversation is completely symmetrical and equivalent, once the two parties of the conversation are determined, the other participating parties serving as the control parties can independently complete a control operation and control information transmission in parallel, and consumption of minimum time can be ensured by parallel control operation.

Description

technical field [0001] The invention relates to the field of quantum security communication, in particular to a symmetrical parallel control quantum security direct communication method. Background technique [0002] Quantum secure direct communication (quantum secure direct communication, QSDC) allows the sender to send a secret message directly to the receiver in a deterministic and secure manner, without the need to establish a key in advance (or synchronously) for encryption. The original QSDC protocol completed one-way communication, so that two users could not exchange secret information at the same time. In 2004, Zhang et al. and Nguyen proposed the concept of quantum dialogue, or BQSDC, to overcome this problem. In this protocol, both legal communication parties can exchange their secret information at the same time. See Zhang Z J, Man Z X, Secure directbidirectional communication protocol using the Einstein -Podolsky-Rosen pairblock.arXiv:quant-ph / 0403215v1(2004);Z...

AI Technical Summary

Problems solved by technology

[0004] These methods can only perform quantum-safe direct communication between certain communication parties. When there are communications between multiple communication parties, quantum channels need to be constructed separately, resulting in increased complexity and time-consuming communication control.

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