Аннотация
We report an experimental realisation of Maxwell's demon in a photonic setup.
We show that a measurement at the single-photon level followed by a
feed-forward operation allows the extraction of work from intense thermal light
into an electric circuit. The interpretation of the experiment stimulates the
derivation of a new equality relating work extraction to information acquired
by measurement. We derive a bound using this relation and show that it is in
agreement with the experimental results. Our work puts forward photonic systems
as a platform for experiments related to information in thermodynamics.
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