Polarization measurement system based on orbital angular momentum assistance

Abstract

The invention, which belongs to the technical field of the quantum optics, provides a polarization measurement system based on orbital angular momentum assistance, wherein the system is capable of realizing precise detection under the circumstance that a to-be-measured polarization state is not damaged. The system comprises a Sagnac interferometer, a spiral phase plate, a first total reflection mirror, a first one-quarter slide, a polarizing film and a detector. The spiral phase plate is arranged on the optical path in the Sagnac interferometer. To-be-measured polarized light is input to the Sagnac interferometer; the light outputted from the Sagnac interferometer enters the first total reflection mirror; light reflected by the first total reflection mirror enters the first one-quarter slide and the light transmitted by the first one-quarter slide enters the polarizing film; and light transmitted by the polarizing film enters the detector. Polarization information can be extracted according to an intensity singular point position of a single beam image. The polarization measurement system is suitable for fields of quantum communication, quantum detection, and weak optical signal detection.

Description

technical field [0001] The invention relates to a polarization measurement system, in particular to a polarization measurement system based on orbital angular momentum assistance, and belongs to the technical field of quantum optics. Background technique [0002] The traditional detection of unknown polarization states is mostly based on destructive measurements. For example, the polarizer is forced to project, and the measured polarization state collapses toward the vibration transmission direction of the detector after measurement. The detection of circular polarization is more complicated, and the polarization state cannot be restored after detection. , that is, non-destructive measurement cannot be realized. This measurement method is very unfavorable for polarization state detection. Therefore, the demand for non-destructive measurement is increasingly strong, and a non-destructive weak measurement scheme is urgently needed in this field. Contents of the invention [...

AI Technical Summary

Problems solved by technology

[0002] The traditional detection of unknown polarization states is mostly based on destructive measurements. For example, the polarizer is forced to project, and the measured polarization state collapses toward the vibration transmission direction of the detector after measurement. The detection of circular polarization is more complicated, and the polarization state cannot be restored after detection. , that is, non-destructive measurement cannot be realized. This measurement method is very unfavorable for polarization state detection. Therefore, the demand for non-destructive measurement is increasingly strong, and a non-destructive weak measurement scheme is urgently needed in this field.

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