Role of measurement in feedback-controlled quantum engines

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In feedback controls, measurement is an essential step in designing protocols according to outcomes. For quantum mechanical systems, measurement has another effect; to supply energy to the measured system. We verify that in feedback-controlled quantum engines, measurement plays a dual role; not only as an auxiliary to perform feedback control but also as an energy supply to drive the engines. We consider a specific engine cycle exploiting feedback control followed by projective measurement and show that the maximum bound of the extractable work is set by both the efficacy of the feedback control and the energy change caused by projective measurement. We take a concrete example of an engine using an immobile spin-1/2 particle as a working substance and suggest two possible scenarios for work extraction.
Publisher
IOP PUBLISHING LTD
Issue Date
2018-01
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, v.51, no.3

ISSN
1751-8113
DOI
10.1088/1751-8121/aa99e4
URI
http://hdl.handle.net/10203/238744
Appears in Collection
NT-Journal Papers(저널논문)
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