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Charge sensing amplification via weak values measurement

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Article number080405
<mark>Journal publication date</mark>24/02/2011
<mark>Journal</mark>Physical review letters
Issue number8
Volume106
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A protocol employing weak values (WVs) to obtain ultrasensitive amplification of weak signals in the context of a solid-state setup is proposed. We consider an Aharonov-Bohm interferometer where both the orbital and the spin degrees of freedom are weakly affected by the presence of an external charge to be detected. The interplay between the spin and the orbital WVs leads to a significant amplification even in the presence of finite temperature, voltage, and external noise.