Quantum key distribution system and method

Abstract

The invention provides a quantum key distribution system comprising a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises a transmitting terminal driving board, a signal laser, a synchronous laser, an intensity modulator, a polarization-maintaining beam splitter, a first adjustable attenuator, a second adjustable attenuator and a transmitting terminal wavelength division multiplexer, the receiving terminal comprises a receiving terminal driving board, a receiving terminal wavelength division multiplexer, a synchronous detector, a polarization beam splitter, a polarization-maintaining beam splitter and a single-photon detector, and the receiving terminal wavelength division multiplexer is connected with the transmitting terminal wavelength division multiplexer through a quantum channel. The invention further provides a quantum key distribution method. Compared with the prior art, the quantum key distribution system disclosed by the invention has the advantages that one polarization beam splitter is added to decompose signal light into two vertical polarization states, the interference under respective polarization states is accomplished by using a polarization-maintaining optical fiber interference ring to obtain a better interference result, an error correction system is eliminated, the redundancy of the system is simplified and the production cost is also reduced.

Description

technical field [0001] The invention relates to the technical field of optical transmission security communication, in particular to a quantum key distribution system and method. 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 RSA algorithm born in the 1970s, which uses...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a quantum key distribution system and method to solve the problem in the prior art that in order to solve the problem of signal light transmission polarization state change in the quantum channel, a deviation correction system will be added at the receiving end, and the optical signal will be restored through the deviation correction system Polarization state, but the deviation correction system requires complex hardware and software components, which brings overall system complexity and technical defects that increase production costs to the entire key distribution system

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