Quantum key allocation system and method based on continuous light chopping

Abstract

The invention discloses a quantum key allocation system and method based on continuous light chopping. A transmitting end comprises a continuous light signal laser, a synchronous laser, a continuous light chopping strength modulator, a decoy state strength modulator, a phase modulator, a first adjustable attenuator, a second adjustable attenuator and a transmitting end wavelength division multiplexer. A receiving end comprises a receiving end wavelength division multiplexer, a synchronous detector, a polarization beam splitter, a polarization-maintaining beam splitter and single photon detector. Compared with the prior art, the system and the method have the advantages that the polarization beam splitter is increased at the receiving end to split signal light into two vertical polarization states; interference under the polarization states is finished through utilization of polarization-maintaining optical fibers; a better interference result is obtained; the system tedious degree is simplified; moreover, a continuous light chopping form is employed at the transmitting end to obtain two light pulses with the consistent polarization states; the production of an interference ring of the transmitting end is avoided; the system tedious degree is further simplified; and the production cost is 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 based on continuous optical chopping. 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 al...

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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 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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