Phase sensing system and method based on weak measurements

Abstract

The application provides a weak measurement based phase sensing system and method, which can be applied to the field of quantum sensing. The system comprises: a phase sensing module which modulates the phase of the incident light selected in advance according to the signal to be measured to obtain detection light; four post-selection modules which post-select four parts of light obtained from the detection light respectively; a detection module which detects the first post-selection light, the second post-selection light, the third post-selection light and the fourth post-selection light respectively; and a processing module which calculates a first term according to the first light intensity and the fourth light intensity and / or the second light intensity and the third light intensity, calculates a second term according to the first light intensity and the second light intensity and / or the third light intensity and the fourth light intensity, processes the first ratio of the predetermined angle and the first term and the second term by using an inverse tangent function to obtain a phase signal, realizes wide dynamic range detection of the phase signal, linearly transforms the phase signal to obtain the size of the signal to be measured, and realizes wide dynamic range detection of the signal to be measured.

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