Adaptive weak measurement method and system for parameter estimation

A self-adaptive algorithm and weak measurement technology, applied in the field of measurement, can solve the problems such as the influence of measurement accuracy, and achieve the effect of improving the accuracy

Inactive Publication Date: 2018-09-07
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In the weak measurement technique, different post-selection will get different Fisher information, which will affect the final measurement accuracy

Method used

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  • Adaptive weak measurement method and system for parameter estimation
  • Adaptive weak measurement method and system for parameter estimation
  • Adaptive weak measurement method and system for parameter estimation

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[0043] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to protection domain of the present invention.

[0044] Such as figure 1 As shown, a kind of adaptive weak measurement method for parameter estimation provided by the present invention includes:

[0045] Weak measurement step: perform a weak measurement to obtain the estimated value of the parameter to be measured;

[0046] Front and rear selection state adjustment step: adjust the front and rear selection states of the system based on the adaptive algorithm according to the estimated value obtained;

[0047] Judgment step: repeatedly execute the weak ...

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Abstract

The invention provides an adaptive weak measurement method and system for parameter estimation. The adaptive weak measurement method comprises the steps of performing weak measurement to obtain an estimated value of a parameter to be measured; adjusting the pre-selection/post-selection state of the system based on an adaptive algorithm according to the obtained estimated value; repeatedly executing weak measurement and pre-selection/post-selection state adjustment until the pre-selection/post-selection of the system achieves the optimum, namely, the pre-selection/post-selection which enables the measured Fisher information amount to be the maximum. The pre-selection/post-selection state of the weak measurement system is adjustable, the pre-selection/post-selection state of the system is adjusted to the optimum according to the adaptive algorithm when the parameter to be measured changes, and the Fisher information amount obtained by the system is enabled to achieve the maximum, so thatthe accuracy of micro-parameter estimation is greatly improved.

Description

technical field [0001] The present invention relates to the field of measurement technology, in particular to an adaptive weak measurement method and system for parameter estimation. Background technique [0002] The traditional weak measurement technology can weakly amplify a small amount, and the weak value amplification weak measurement technology can appropriately amplify the original small offset to an observable position through appropriate post-selection, so as to realize the measurement of small quantities. Measurement. Weak value amplification Weak measurement technology has great technical advantages, but there are also some problems. For example, weak value amplification and weak measurement use weak coupling and post-selection technology to properly amplify the original very small parameter to an observable position, so as to indirectly measure the small amount. That is to say, when the rear selection angle is closer to the perpendicular to the front selection ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/00G05B13/04
CPCG01D21/00G05B13/042
Inventor 黄靖正李斐曾贵华
Owner SHANGHAI JIAO TONG UNIV
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