Multifunctional quantum secret communication node structure based on time division-wavelength division multiplexing

Abstract

The invention relates to a multifunctional quantum secret communication node structure based on time division-wavelength division multiplexing, belongs to the technical field of quantum secret communication, and particularly relates to a method for realizing a transceiving function of a quantum secret communication node through the time division multiplexing technology. For the quantum secret communication node based on a single photo scheme and a Faraday- Michelson interference ring (F-M) structure, the bidirectional transceiving function of the node is achieved as long as an optical circulator and time division control logic of the transceiving function are added to the node. The node structure can be applied to a trusty relay node, a super node and an authentication center node to improve the reliability and expansibility of a whole quantum secret communication network. Strict clock synchronization required by the quantum secret communication network is achieved through the wavelength division multiplexing technology, and the synchronous time delay adjustment range is reduced.

Description

1. Technical field [0001] The invention relates to the technical field of quantum secure communication networks, in particular to the application of time division multiplexing technology in multifunctional quantum communication nodes. 2. Background technology [0002] As an important means of ensuring communication security, cryptography has always been highly concerned by the communication field. According to whether the encryption and decryption keys are the same, the existing cryptographic systems are mainly divided into two systems: "symmetric cryptography" and "asymmetric cryptography". The symmetric cryptosystem has the advantages of fast encryption and decryption speed and short key length, but the key distribution requires a secure channel, and the number of keys is large, which is difficult to manage. The asymmetric cryptosystem is divided into the public key and the private key held by the user. The key distribution is relatively easy, the management is simple, an...

AI Technical Summary

Problems solved by technology

[0005] As the scale of quantum secure communication networks gradually increases and the network topology tends to become more complex, the reliability and scalability of quantum nodes will become a huge challenge for large-scale commercial use of quantum secure communication networks.

In quantum secure communication, the optical bit error rate caused by the relatively low visibility of interference fringes has become one of the reasons restricting the performance of the system, and the high maintenance cost required to improve the visibility of interference fringes in quantum secure communication nodes will increase with the The expansion of the network scale has become one of the main constraints

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