Channels, measurements, and postselection in quantum thermodynamics

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We analyze the benefit, in terms of extracting work, of having a single use of a quantum channel or measurement in quantum thermodynamics. This highlights a connection between unital and catalytic channels, and some subtleties concerning the conditional work cost of implementing a measurement given that a certain result was obtained. We also consider postselected measurements and show that any nontrivial postselection leads to an unbounded work benefit.
Original languageEnglish
Article number014111
JournalPhysical Review E
Issue number1
Publication statusPublished - 12 Jul 2021

Bibliographical note

Funding Information:
The authors acknowledge helpful conversations with S. Popescu. T.P. acknowledges support from the EPSRC (Grant No. EP/S139151-108).

Publisher Copyright:
© 2021 American Physical Society.


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