Quantum key distribution system and method based on time-division multiplexing

Abstract

The invention discloses a quantum key distribution system and method based on time-division multiplexing. The system comprises a transmitting end and a receiving end, wherein a laser capable of transmitting continuous light and single photon is arranged at the transmitting end, and the laser transmits the signal light and the synchronization light through a time division multiplexing way; furthermore, a polarization beam splitter is added at the receiving end of the system to decompose the signal into two vertical polarization states, the inference under respective polarization state is finished by use of a polarization maintaining optical fiber interference ring, thereby obtaining a good interference result; the influence on the interference result by the light polarization state influenced by the bi-refraction effect in the optical fiber transmission process is avoided; and meanwhile, a deviation correction system is abandoned, the system redundancy is simplified, and the production cost is lowered; the single laser is driven to transmit the signal light and the synchronization light in the time-division multiplexing way I the system, the complexity and the production cost of the system are lowered.

Description

technical field [0001] The invention relates to the technical field of optical transmission security communication, in particular to a quantum secret key distribution system and method based on time division multiplexing. Background technique [0002] With the widespread popularization of the Internet, information transmission among human beings has reached an unprecedented quantity and frequency, and various private information is increasingly exposed on the Internet. Therefore, human beings' demand for confidential communication has also reached an unprecedented height. The current Internet information security encryption method is called "public key" cryptography system. Its principle is to generate a public key that spreads on the network and a private key that stays inside the computer through an encryption algorithm. The two keys must match Use to achieve a complete encryption and decryption process. [0003] The encryption standard used by the modern Internet is the ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a quantum key distribution system and method based on time-division multiplexing, so as to solve the technical defects of the quantum key distribution system structure in the prior art that is too complicated and the production cost is too high

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