Spectrum generating device, measuring device and measuring method of physical quantity variation

Abstract

The invention discloses a frequency spectrum generation device and a physical quantity change amount measurement device and method. The device and method adopt an optical parametric oscillator in a compact structure to convert continuous single-frequency laser in an optical communication wave band into a squeezed light field in the optical communication wave band, thereby effectively reducing the de-coherence effect due to loss when the continuous variable squeezed light field transmits in an optical fiber, and maintaining compression degree to be maximum degree to allow the squeezed light field not to be damaged when transmitting in the fiber; and the squeezed light field in the optical communication wave band is injected to a vacuum channel of a fiber Mach-Zehnder interferometer, so that quantum precision measurement lower than shot noise limit is realized, and sensitivity of the fiber Mach-Zehnder interferometer is improved. The device is ingenious in structure, high in anti-interference capability and high in sensitivity, and is more suitable for measurement of tiny physical quantity change amount.

Description

technical field

[0001] The invention relates to the technical field of continuous variable quantum optics and quantum precision measurement, in particular to a spectrum generating device, a measuring device and a measuring method for physical quantity variation. Background technique

[0002] Quantum precision measurement is one of the important foundations of modern science and technology. Quantum precision measurement mainly studies how to use quantum effects and technologies to improve the measurement accuracy of physical quantities. The measurement process of any physical quantity will be accompanied by noise, including the classical noise and quantum noise of the system, which limit the measurement accuracy. Classical noise mainly comes from factors such as technical defects and unsatisfactory instruments. With the development of science and technology, the classical noise of the system is greatly reduced, often negligible, and the quantum noise determined by the nature...

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