Information-to-work conversion by Maxwell’s demon in a superconducting circuit quantum electrodynamical system

Y. Masuyama, K. Funo, Y. Murashita, A. Noguchi, S. Kono, Y. Tabuchi, R. Yamazaki, M. Ueda and Y. Nakamura ()
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Y. Masuyama: The University of Tokyo
K. Funo: Peking University
Y. Murashita: The University of Tokyo
A. Noguchi: The University of Tokyo
S. Kono: The University of Tokyo
Y. Tabuchi: The University of Tokyo
R. Yamazaki: The University of Tokyo
M. Ueda: The University of Tokyo
Y. Nakamura: The University of Tokyo

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Information thermodynamics bridges information theory and statistical physics by connecting information content and entropy production through measurement and feedback control. Maxwell’s demon is a hypothetical character that uses information about a system to reduce its entropy. Here we realize a Maxwell’s demon acting on a superconducting quantum circuit. We implement quantum non-demolition projective measurement and feedback operation of a qubit and verify the generalized integral fluctuation theorem. We also evaluate the conversion efficiency from information gain to work in the feedback protocol. Our experiment constitutes a step toward experimental studies of quantum information thermodynamics in artificially made quantum machines.

Date: 2018
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DOI: 10.1038/s41467-018-03686-y

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