Full-time all-pass quantum network router and method for expanding quantum secret communication network

Abstract

The invention relates to a method for expanding a quantum secret communication network and a novel full-time all-pass quantum network router. The invention is characterized in that the expandability of a quantum secret communication network is enhanced and the consumption of optical wavelength resources is reduced by combining the characteristics of quantum key distribution and introducing an optical circulator and a polarizing beam splitter to increase the degrees of freedom of optical signals. For a quantum secret communication network having N numbered optical wavelength resources, a maximum of 4N+1 numbered network users can be supported. Each port of the quantum network router is provided with an external interface and a plurality of internal interfaces, wherein the external interface and the internal interfaces are respectively used for the connection with quantum secret communication network users and the connection among internal ports. By using the quantum network router as the core, a full-time all-pass backbone quantum secret communication network can be effectively constructed.

Description

technical field [0001] The invention relates to the technical field of quantum secure communication networks, in particular to the quantum key distribution network technology. Background technique [0002] The concept of quantum key distribution was proposed by Bennett and Brassard in 1984, which provides a perfect solution to the key distribution problem in cryptography. The basic principles of quantum mechanics guarantee the unconditional security of the distributed key. Although the current point-to-point quantum key distribution distance has reached 200 kilometers, from the perspective of practical application, when key distribution is performed among multiple users, the quantum key distribution technology will inevitably develop from point-to-point to a quantum key distribution network, namely Quantum secure communication network. [0003] Existing quantum key distribution networks include quantum key distribution networks based on quantum relays, quantum key distribut...

AI Technical Summary

Problems solved by technology

At present, the quantum key distribution network of quantum relay and quantum entanglement is basically in the theoretical research stage. The single-channel performance of the quantum key distribution network of the optical beam splitter decreases sharply with the increase of the number of users, and the scalability is poor. The quantum key distribution network of the switch needs to be switched actively, and the quantum key distribution network based on the optical beam splitter and the optical switch cannot realize the full-time all-pass between any two users

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