Real-time ranging system and its realization method based on quantum entangled light

Abstract

The invention provides a real-time range measurement system based on quantum entangled light. The real-time range measurement system comprises a light source module and a circuit module, wherein the light source module is used for generating signal light and reference light; the circuit module is used for calculating a distance to be measured based on the input signal light and reference light. The light source module comprises a semiconductor laser, a filter, a one-quarter wave plate, a half-wave plate, a polarizing film, a periodically polarized crystal and a polarization beam splitter, wherein the semiconductor laser is used for generating pump light which is orderly incident into the one-quarter wave plate, the half-wave plate, the polarizing film and the periodically polarized crystal and then filtered out by the filter, and meanwhile, H polarized light and V polarized light are generated; the polarization beam splitter is used for separating out the signal light and the reference light from the H polarized light and the V polarized light. The invention also provides a corresponding method. The anti-jamming characteristic of the real-time range measurement system based on quantum entangled light is improved by use of a second-order association algorithm; besides, the real-time range measurement system is capable of realizing real-time data processing by use of FPGA (Field Programmable Gate Array), and therefore, data acquisition and data processing can be carried out simultaneously.

Description

technical field [0001] The present invention relates to quantum navigation, in particular to a real-time ranging system based on quantum entangled light and its implementation method. Background technique [0002] With the development of human civilization, the demand for ranging technology also arises as the times require. Today, ranging technology has penetrated into all fields of human life, and plays a vital role in politics, economy, military and other fields. [0003] The traditional laser ranging technology mainly uses the characteristics of strong directivity and high brightness of laser for ranging. According to the working mode of lasers, they can be divided into continuous lasers and pulsed lasers. This ranging method mainly calculates the round-trip time by receiving the reflection of the laser, and finally calculates the distance. However, this distance measurement method will be limited by the shot noise limit and cannot break through this limit, and quantum...

AI Technical Summary

Problems solved by technology

The uncertainty principle in quantum mechanics determines that the measurement based on quantum theory will be limited by the Heisenberg limit, but it is far beyond the shot noise limit that can be achieved by traditional measurement

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