Decoherence effects on weak value measurements in double quantum dots

Thomas, Mark and Romito, Alessandro (2012) Decoherence effects on weak value measurements in double quantum dots. Physical Review B - Condensed Matter and Materials Physics, 86 (23). ISSN 1098-0121

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Abstract

We study the effect of decoherence on a weak value measurement in a paradigm system consisting of a double quantum dot continuously measured by a quantum point contact. Fluctuations of the parameters controlling the dot state induce decoherence. We find that, for measurements longer than the decoherence time, weak values are always reduced within the range of the eigenvalues of the measured observable. For measurements at shorter time scales, the measured weak value strongly depends on the interplay between the decoherence dynamics of the system and the detector backaction. In particular, depending on the postselected state and the strength of the decoherence, a more frequent classical readout of the detector might lead to an enhancement of weak values.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review B - Condensed Matter and Materials Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
139245
Deposited By:
Deposited On:
02 Dec 2019 14:15
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 12:21