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Weak Values and Precision Measurements

John C. Howell

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

I will discuss the use of weak values for performing precision deflection, spectral, velocity and gravimetric measurements. I will show that the concepts behind weak values can lead to technical noise suppression. Article not available.

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Weak Values and Precision Measurements

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I will discuss the use of weak values for performing precision deflection, spectral, velocity and gravimetric measurements. I will show that the concepts behind weak values can lead to technical noise suppression.

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The main purpose of this short article is to give a brief overview of the development of the very interesting weak measurement protocol. I add some comments relating to the reality of weak values, and also comment on the allowed values of observables between measurements.

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We consider different types of technical noise in an optical context and show that weak-value amplification techniques (using a small fraction of photons) compare favourably with standard techniques (using all of them). We measure small beam deflections of an optical beam by monitoring the dark port in a Sagnac interferometer (weak-value technique) or by focusing the entire beam onto a split detector (standard technique). In all cases, the weak-value technique performs favourable in precision respect to the standard technique.