Quantum key distribution light source based on spontaneous radiation light source

Abstract

The invention provides a quantum key distribution light source based on a spontaneous radiation light source. A pulse generator is used for driving a first intensity modulator, a second intensity modulator and a polarization modulator; the spontaneous radiation light source is used for outputting a continuous direct current optical signal; a polarization beam splitter is used for generating a linearly polarized direct current optical signal; a filter is used for performing spectral filtering on the linearly polarized direct current optical signal; the first intensity modulator is used for modulating an optical signal output by the filter and generating a narrow optical pulse signal; the second intensity modulator is used for modulating the narrow optical pulse signal generated by the firstintensity modulator and generating a signal state, a decoy state and a vacuum state which are required by quantum key distribution; the polarization modulator is used for modulating an optical signaloutput by the second intensity modulator and generating +, -, L and R polarization states which are required by the quantum key distribution; and an attenuator is used for performing energy attenuation on an optical signal output by the polarization modulator and then outputting the energy-attenuated optical signal.

Description

technical field [0001] The disclosure relates to the field of quantum communication, in particular to a quantum key distribution light source based on a spontaneous emission light source. Background technique [0002] As one of the frontier fields of physics today, quantum communication is based on the basic physical principles of quantum mechanics to ensure the unconditional security of information transmission, and it is the first development direction of quantum information to be practical. The core of quantum communication is Quantum Key Distribution (Quantum Key Distribution, QKD). Quantum key distribution can realize the sharing of unconditionally secure quantum keys between distant communication parties. Secure communication for rigorous mathematical proofs of information theory. By launching multiple quantum satellites, forming a quantum constellation covering the whole world, and then creating a quantum optical fiber network between cities and cities on the ground,...

AI Technical Summary

Problems solved by technology

However, the frequency conversion method needs to use pump light and nonlinear crystals to convert the frequency of quantum light. The system structure is complex, the volume is large, and the technical implementation is difficult. The active phase external modulation method needs to achieve high-speed external modulation of continuous multiple phase states. Use of multiple phase modulators reduces system integration and increases cost significantly

These two solutions have greatly increased the complexity and implementation difficulty of the QKD system, and it is difficult to meet the needs of quantum communication system integration and practicality

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