Experimental demonstration of information to energy conversion in a quantum system at the Landauer limit
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2016
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Landauer’s principle sets fundamental thermodyna mical constraints for classical and quantum
information processing, thus affecting not only
various branches of physics, but also of computer
science and engineering. Despite its importance,
this principle was only recently experimentally
considered for classical systems. Here we employ a
nuclear magnetic resonance set-up to experimentally
address the information to energy conversion in
a quantum system. Specifically, we consider a
three nuclear spins S = 12 (qubits) molecule—the
system, the reservoir and the ancilla—to measure
the heat dissipated during the implementation of
a global system–reservoir unitary interaction that
changes the information content of the system. By
employing an interferometric technique, we were able
to reconstruct the heat distribution associated with
the unitary interaction. Then, through quantum state
tomography, we measured the relative change in the
entropy of the system. In this way, we were able to
verify that an operation that changes the information
content of the system must necessarily generate heat in the reservoir, exactly as predicted by Landauer’s principle. The scheme presented here
allows for the detailed study of irreversible entropy production in quantum information
processors.
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PETERSON, J. P. S. et al. Experimental demonstration of information to energy conversion in a quantum system at the Landauer limit. Proceedings of the Royal Society. A, Mathematical, Physical, and Engineering Sciences, London, v. 472, n. 2188, e20150813, 2016. DOI: 10.1098/rspa.2015.0813 . Disponível em: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4891656/. Acesso em: 2 maio 2023.