Combined quantum broadcast communication monitoring method based on partially entangled GHZ channel

Abstract

The invention discloses a combined quantum broadcast communication monitoring method based on a partially entangled GHZ channel. The method includes the steps that a multi-particle partially entangled GHZ state is prepared through a sender on the basis of an information transfer mode, a corresponding number of auxiliary particles are led in according to the number of supervisors to be used as control particles, a part of particles in the GHZ state are selected to be used as monitored particles, CNOT operation is performed on the auxiliary particles and the selected monitored particles, then the particles are sent to the supervisors and receiving users, the sender performs Bell measurement, check bits are published, the supervisors perform single-particle measurement, measuring results are used as authorization information to be released to the corresponding legal authorization limited users, and the authorization limited users obtain real broadcast data of the sender according to Bell measuring results, checking information and the authorization information. According to the method, the effect that the flow directions of the broadcast data are monitored by the supervisors in a combined mode under the authorization mode is achieved, the requirement for the maximum entangled channel and complicated entanglement concentration operation can be avoided, and the method has good practicability and feasibility.

Description

technical field [0001] The invention relates to a broadcast communication method of a quantum network, in particular to a joint monitoring quantum network communication method based on partially entangled GHZ channels. Background technique [0002] Quantum informatics mainly includes quantum communication and quantum computing. Quantum communication uses the quantum state as the information unit to realize the effective transmission of information. In addition to the traditional classical channel, the more important thing is to establish a quantum entanglement channel between the communicating parties. Since the first experimental scheme of quantum teleportation based on quantum entanglement was proposed in 1993, the first experiment in the world realized quantum teleportation based on Bell entanglement channel in 1997, and then in order to realize long-distance quantum communication, between the sending and receiving points A quantum repeater based on entanglement exchange...

AI Technical Summary

Problems solved by technology

In fact, due to the influence of environmental coupling, decoherence and noise in the preparation and transmission, it is often difficult to obtain the maximum entangled state based on the existing experimental technology, and it is necessary to use the entanglement concentration operation to extract the approximate maximum state from the partially entangled state. Entangled state

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