Stable decoy state pulse intensity modulation method and intensity modulator

Abstract

The embodiment of the invention discloses a stable decoy state pulse intensity modulation method and an intensity modulator, and the method comprises the steps: under the condition that the intensity of the decoy state pulse output by the intensity modulator is a stable point, determining the number of channels of an intensity modulator, the beam splitting ratio of a beam splitter in each channel, the attenuation rate of an adjustable attenuator and the target input pulse intensity of the input intensity modulator; through the maximum decoy state pulse intensity,determining target direct current voltage intensity needing to be loaded by each first terminal; and under the condition that the first terminal loads the target direct-current voltage intensity and the input pulse intensity is the target input pulse intensity, determining radio-frequency signal amplitudes needing to be loaded by the second terminals corresponding to decoy state pulses with different intensities through a preset first formula; therefore, by means of the method, output of any decoy pulses of various intensities can be met, and the influence of voltage fluctuation on the intensity of the output decoy pulses is small.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to an intensity modulation method and an intensity modulator of stable decoy state pulses. Background technique [0002] Quantum secure communication based on decoy technology (English full name: decoy state method) often needs to modulate the transmitted pulse to a variety of different pulse intensities, among which inaccurate pulse intensity modulation will bring potential security to the quantum key distribution system sexual issues. [0003] At present, Mach-Zehnder modulators or Sagnac modulators are usually used to generate decoy state pulses, but these two modulators can only modulate a limited strength of decoy pulses, which cannot satisfy most quantum secrecy based on decoy state methods The communication system needs to modulate three or four pulse intensities, and the output decoy pulse is greatly affected by voltage fluctuations, resulting in differences between the...

AI Technical Summary

Problems solved by technology

[0002] Quantum secure communication based on decoy technology (English full name: decoy state method) often needs to modulate the transmitted pulse to a variety of different pulse intensities, among which inaccurate pulse intensity modulation will bring potential security to the quantum key distribution system sexual problems

[0003] At present, Mach-Zehnder modulators or Sagnac modulators are usually used to generate decoy state pulses, but these two modulators can only modulate a limited strength of decoy pulses, which cannot satisfy most quantum secrecy based on decoy state methods The communication system needs to modulate three or four pulse intensities, and the output decoy pulse is greatly affected by voltage fluctuations, resulting in differences between the actual modulated pulse intensity and the desired modulated pulse intensity

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