CPC G01R 23/02 (2013.01) [G01R 23/16 (2013.01)] | 11 Claims |
1. A frequency measurement method of a microwave signal, comprising:
generating, when a light source irradiates an electro-optical crystal disposed in a microwave electric field, to-be-detected emergent light under an action of the electro-optical crystal, wherein a wave function of the to-be-detected emergent light is periodically modulated with a specific oscillation frequency of the microwave electric field;
inputting the to-be-detected emergent light into a polarization beam splitter;
inputting an output of the polarization beam splitter into an attenuator to attenuate the to-be-detected emergent light to be at a single-photon level;
detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector, wherein the detection result comprises an arrival time of a photon of the to-be-detected emergent light; and
determining a frequency of the microwave signal in the microwave electric field based on the detection result of the single-photon detector and a Fourier transform algorithm,
wherein generating the to-be-detected emergent light under the action of the electro-optical crystal comprises:
generating, based on a polarization modulation, by placing a Faraday reflector after the electro-optical crystal, the to-be-detected emergent light when the light source passes through the electro-optical crystal twice.
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