Quantum communication networking method and system based on multi-wavelength entangled light source

Abstract

The invention discloses a quantum communication networking method and system based on a multi-wavelength entangled light source. The method comprises the steps: by a multi-wavelength entangled light source, generating entangled single photons which are equal in frequency interval and paired; performing wavelength channel configuration on the entangled single photons by using a relatively mature dense wavelength division multiplexing technology in a classical optical fiber communication system; and constructing a quantum network server independent of the users and distributing the entangled photons of each wavelength to each user, thereby ensuring that every two users can share a pair of independent entangled single photons, and finally realizing a quantum communication network in which multiple users are randomly interconnected.

Description

technical field [0001] The invention belongs to the technical fields of nonlinear optics, optical fiber communication, and quantum communication, and relates to a quantum communication networking method and system based on multi-wavelength entanglement light sources, in particular to a method and system that uses spontaneous nonlinear effects to realize broadband entangled single-photon output, through intensive The wavelength channel configuration of the wavelength division multiplexing system realizes the quantum communication networking technology of multi-user arbitrary interconnection. Background technique [0002] With the progress of the times and the sharp increase in the volume of information interaction traffic, the security of information transmission based on optical fiber communication networks has attracted widespread attention. Attacks on optical fiber communication lines mainly include "eavesdropping" and "cracking". Among them, "eavesdropping" refers to the...

AI Technical Summary

Problems solved by technology

The main technical routes of quantum communication networking at this stage are: (1) Multi-user arbitrary interconnection quantum communication network based on point-to-point quantum communication system: both communication parties need to be equipped with separate quantum communication equipment, which faces huge resource overhead; trusted nodes in the business layer Although it can effectively expand the parallel working capability of double-terminal quantum communication devices, it also partially loses the inherent security properties of quantum communication; (2) Multi-group user quantum communication networks based on point-to-many quantum communication systems: users need to be divided into multiple A user group allows multiple users in the same group to share the same quantum device and quantum channel, but does not support quantum communication interconnection among members of the group; (3) Quantum relay communication network: mainly based on quantum storage technology and quantum entanglement exchange expansion technology and quantum state routing technology, however, there has been no good solution to the long-term storage problem of quantum states; (4) Quantum communication network based on high-dimensional quantum communication protocol: it can provide quantum communication services for multiple users, and each user shares the same Hilbert space and independently generate quantum state information in the subspaces they occupy; however, adding or deleting users needs to modify the Hilbert space as a whole, which seriously affects the flexible adjustment and high-efficiency working ability of the quantum communication network

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