High-precision magnetic field meter based on novel weak quantum measurement

Abstract

The invention discloses a high-precision magnetic field meter based on novel weak quantum measurement. The magnetic field meter comprises an LED white light source, an initial state preparing system, a magnetic light coupling system and a detection system; the LED white light source generates wide-spectrum photons which interact with a magnetic field; the initial state preparing system collimates the wide-spectrum photons generated by the LED light source, and prepares a polarization state of the wide-spectrum photons into a needed quantum state; the magnetic light coupling system couples the wide-spectrum photons prepared into the quantum state with the magnetic field, and then output the coupled photons; the detection system converts a circular polarization state of the wide-spectrum photons into a linear polarization state, introduces a stable offset bias phase difference between horizontal and vertical polarization in the linearly polarization state, and sets a working point of the system in a most sensitive area; polarization-state projection is carried out to implement post selection of the wide-spectrum photons, and the spectral distribution of the wide-spectrum photons after post selection is measured; and change of the magnetic field intensity where a magneto-optic coupling system is placed is measured by comparing change of the spectral distribution. According to schemes of the invention, the specific bias phase difference is used to change the working point of traditional weak measurement, and the measuring precision is improved greatly. Compared with a superconductive quantum interference magnetic field meter, similar resolution can be reached needless of a low-temperature device or an interference device, the cost is low, and the working state is stable.

Description

technical field [0001] The invention relates to the field of precision measurement, in particular to a high-precision magnetic field meter based on novel quantum weak measurement. Background technique [0002] Using the basic principles of physics to achieve high-precision measurement is an important driving force to promote the development of physics itself and precision measurement technology, especially the high-precision measurement method based on optical principles and technology can be used to measure the tiny phase disturbance and Enables imaging beyond the diffraction limit. Weak measurement is an effective means to amplify weak signals based on the basic principles of quantum mechanics. It can bring a higher signal-to-noise ratio while consuming a large number of measurement samples, and has a resolution that cannot be achieved by classical methods. [0003] The meaning of measurement is to quantify a certain property of an object, that is, an observable quantity ...

AI Technical Summary

Problems solved by technology

There are seven commonly used measuring instruments: torque magnetometer, fluxmeter and impact galvanometer, rotating coil magnetometer, fluxgate magnetometer,

Images