Method and system for quantum communication security

Abstract

The invention relates to a method and a system for quantum communication security. An Alice terminal comprises a watchdog detector, an optical attenuator, a phase modulator, a reflector, a controller and a photon emitter; and a Bob terminal comprises a laser, a time division multiplex / demultiplex system, a phase modulator, a single photon detector, a controller, an optical switch and a reflector. The method and the system have the advantages that: (1) the two-way, stable and safe distribution of quantum keys is realized, the polarization and phase change of a single photon can be automatically compensated, and the aim of stable long-distance transmission is achieved; (2) the Alice terminal adopts the watchdog detector, on one hand, Trojan attack and intermediary attack can be detected by measuring the number of weak pulses reaching or leaving the Alice terminal, so that the communication security is improved greatly, and on the other hand, the communication speed and communication distance of the system are improved greatly; and (3) the Alice terminal and the Bob terminal can be adjusted and corrected respectively, can select mu independently without transmitting photons by means of unsafe optical fiber lines so as to ensure the system security.

Description

technical field [0001] The invention relates to the field of special equipment for quantum secure communication in the communication field, in particular to a two-way, stable and safe quantum communication secret method and system thereof. Background technique [0002] Quantum communication technology is an important branch of quantum information science. It uses the quantum state as the information unit and uses some principles of quantum mechanics to transmit and protect information. Usually, the two parties in the communication use the quantum state as the information carrier and use the principle of quantum mechanics to transmit and protect information. Quantum channel transmission, a method of establishing a shared key between two parties in secure communication, is called Quantum Key Distribution (Quantum Key Distribution-QKD), and its security is determined by the "Heisenberg Uncertainty Relation" in quantum mechanics and The "single quantum non-reproducibility theore...

AI Technical Summary

Problems solved by technology

In the existing technology, there is a "plug and play" QKD system abroad, but this system limits the key distribution rate due to back Rayleigh scattering, and the round-trip key transmission method cannot resist Trojan horse attacks and man-in-the-middle attacks

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