Quantum key distribution (QKD) system and method irrelevant to reference system and measuring equipment based on sagnac ring

Abstract

The invention discloses a QKD (Quantum Key Distribution) system and method irrelevant to a reference system and measuring equipment based on a sagnac ring. The QKD system comprises a transmitting end Alice, a transmitting end Bob and a measuring end Charlie, the transmitting end Alice and the transmitting end Bob are connected with the measuring end Charlie through a free space channel; the transmitting end Alice comprises a laser 1 and a first sagnac ring modulator, and the first sagnac ring modulator comprises an intensity modulator IM1, a polarization controller PC1, an optical circulator Cir1, a first transmitting end sagnac ring, an optical attenuator ATT1 and an optical fiber collimator Col1; the transmitting end Bob comprises a laser device Laser2 and a second sagnac ring modulator, and the second sagnac ring modulator comprises an intensity modulator IM2, a polarization controller PC2, an optical circulator Cir2, a second transmitting end sagnac ring, an optical attenuator ATT2 and an optical fiber collimator Col2; according to the invention, the problem of complex state preparation in the prior art is solved, the speed is higher, the stability is better, the influence of the environment on the polarization state is eliminated, reference system alignment is not needed, the complexity of the system is simplified, and the code rate is improved.

Description

technical field [0001] The invention belongs to the technical field of quantum information and optical communication, and in particular relates to a QKD system and method independent of reference frame independent measurement equipment based on sagnac rings. Background technique [0002] Quantum key distribution technology is based on the basic principles of quantum mechanics, which theoretically proves that unconditionally secure key sharing can be achieved. However, due to the non-ideal characteristics of actual devices and equipment, there is still a certain gap between the actual security of the quantum key distribution system and the theoretical one. The single-photon detector in the detection end is the most vulnerable part, which seriously affects the quantum key distribution system. The actual security of the key distribution system. [0003] Measurement Device Independent QuantumKey Distribution (MDI QKD) perfectly solves the security problem caused by the non-idea...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a reference frame independent measurement device-independent QKD system based on the sagnac ring, and the present invention more preferably proposes to utilize the Sagnac ring modulator to generate the polarization state to carry out the measurement device-independent protocol, and the operation Simple, easy to implement, and solves the relatively complicated problem of state preparation in the prior art

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