Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevX.4.011032
Title: When amplification with weak values fails to suppress technical noise
Authors: Knee, G.C.
Gauger, E.M. 
Keywords: Optics
Quantum information
Quantum physics
Issue Date: 2014
Citation: Knee, G.C., Gauger, E.M. (2014). When amplification with weak values fails to suppress technical noise. Physical Review X 4 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevX.4.011032
Abstract: The application of postselection to a weak quantum measurement leads to the phenomenon of weak values. Expressed in units of the measurement strength, the displacement of a quantum coherent measuring device is ordinarily bounded by the eigenspectrum of the measured observable. Postselection can enable an interference effect that moves the average displacement far outside this range, bringing practical benefits in certain situations. Employing the Fisher-information metric, we argue that the amplified displacement offers no fundamental metrological advantage, due to the necessarily reduced probability of success. Our understanding of metrological advantage is the possibility of a lower uncertainty in the estimate of an unknown parameter with a large number of trials. We analyze a situation in which the detector is pixelated with a finite resolution and in which the detector is afflicted by random displacements: imperfections that degrade the fundamental limits of parameter estimation. Surprisingly, weak-value amplification is no more robust to them than a technique making no use of the amplification effect brought about by a final, postselected measurement.
Source Title: Physical Review X
URI: http://scholarbank.nus.edu.sg/handle/10635/126343
ISSN: 21603308
DOI: 10.1103/PhysRevX.4.011032
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

91
checked on Sep 23, 2022

WEB OF SCIENCETM
Citations

89
checked on Sep 23, 2022

Page view(s)

129
checked on Sep 22, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.