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Entropy 2016, 18(7), 244;

Multiatom Quantum Coherences in Micromasers as Fuel for Thermal and Nonthermal Machines

Physics Department, University of Michigan, 450 Church St., Ann Arbor, MI 48109-1040, USA
Department of Chemical Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
Department of Physics, Koç University, Sarıyer 34450, Istanbul, Turkey
Author to whom correspondence should be addressed.
Academic Editor: Ronnie Kosloff
Received: 26 May 2016 / Revised: 22 June 2016 / Accepted: 23 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Quantum Thermodynamics)
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In this paper, we address the question: To what extent is the quantum state preparation of multiatom clusters (before they are injected into the microwave cavity) instrumental for determining not only the kind of machine we may operate, but also the quantitative bounds of its performance? Figuratively speaking, if the multiatom cluster is the “crude oil”, the question is: Which preparation of the cluster is the refining process that can deliver a “gasoline” with a “specific octane”? We classify coherences or quantum correlations among the atoms according to their ability to serve as: (i) fuel for nonthermal machines corresponding to atomic states whose coherences displace or squeeze the cavity field, as well as cause its heating; and (ii) fuel that is purely “combustible”, i.e., corresponds to atomic states that only allow for heat and entropy exchange with the field and can energize a proper heat engine. We identify highly promising multiatom states for each kind of fuel and propose viable experimental schemes for their implementation. View Full-Text
Keywords: quantum thermodynamics; quantum coherence; micromaser quantum thermodynamics; quantum coherence; micromaser

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Dağ, C.B.; Niedenzu, W.; Müstecaplıoğlu, Ö.E.; Kurizki, G. Multiatom Quantum Coherences in Micromasers as Fuel for Thermal and Nonthermal Machines. Entropy 2016, 18, 244.

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