Ultra-resolution and ultra-sensitivity ranging system based on entangled coherent state

Abstract

The invention relates to an ultra-resolution and ultra-sensitivity ranging system based on an entangled coherent state. The system consists of a quantum state preparation system, a emit and receive system, a quantum state coherent detection system, and a computer comprehensive analysis system, wherein a quantum source generates a coherent superposed laser quantum state, a laser generates a coherent laser quantum state, the above two laser quantum states are interfered by a first 50:50 beam splitter so as to obtain an entangled coherent state, a detection signal is emitted through an optical emission system so as to irradiate a target, an echo signal is received through an optical receiving system, the echo signal and a local oscillation signal are interfered by a second 50:50 beam splitter, the interference signal carries distance information of the target, the interference signal is converted into a binary output electric signal, the electric signal is analyzed comprehensively by thecomputer comprehensive analysis system, so as to offer distance information of the target. Through adoption of the system, a goal of ultra-resolution and ultra-sensitivity measurement of a signal is achieved.

Description

Technical field: [0001] The invention relates to laser interference technology, in particular to a super-resolution and super-sensitivity ranging system based on entangled coherent states. Background technique: [0002] Interferometry is one of the important measurement techniques in physics. The goal of interferometry is to obtain a high-precision estimate of the physical quantity of interest, which is normally the phase gathered on one arm of the interferometer. Enhanced phase estimation benefits many research areas, including quantum metrology, imaging, and sensing. The nonclassical state can enhance the spatial resolution of imaging, the nonclassical state can improve the distance resolution and ranging accuracy of the ranging system, and the nonclassical optical quantum state can also break through the limit of classical diffraction or shot noise. The practical significance of the advantages of quantum entanglement has led to the development of quantum sensors, quantu...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a super-resolution and super-sensitivity ranging system based on entangled coherent states, which is used to solve the problem that resolution and sensitivity are limited by classical limits , which realizes the distance detection with the signal resolution of the Araelian diffraction limit and the sensitivity of the sub-shotgun noise limit

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