Engineering a heat engine purely driven by quantum coherence
- URL: http://arxiv.org/abs/2209.11593v1
- Date: Fri, 23 Sep 2022 13:56:45 GMT
- Title: Engineering a heat engine purely driven by quantum coherence
- Authors: Stefan Aimet and Hyukjoon Kwon
- Abstract summary: Coherence is a resource beneficial or detrimental to the performance of quantum heat engines.
We show that optimal coherence charging and extractable work is achieved when the coherence bath has an intermediate degree of coherence.
The efficiency of the engine, given by the extractable work per input coherence flow, is optimised by avoiding coherence being stored in the system-bath correlations that is inaccessible to work.
- Score: 5.685589351789462
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The question of whether quantum coherence is a resource beneficial or
detrimental to the performance of quantum heat engines has been thoroughly
studied but remains undecided. To isolate the contribution of coherence, we
analyse the performance of a purely coherence-driven quantum heat engine, a
device that does not include any heat flow during the thermodynamic cycle. The
engine is powered by the coherence of a multi-qubit system, where each qubit is
charged via interaction with a coherence bath using the Jaynes-Cummings model.
We demonstrate that optimal coherence charging and hence extractable work is
achieved when the coherence bath has an intermediate degree of coherence. In
our model, the exctractable work is maximised when four copies of the charged
qubits are used. Meanwhile, the efficiency of the engine, given by the
extractable work per input coherence flow, is optimised by avoiding coherence
being stored in the system-bath correlations that is inaccessible to work. We
numerically find that the highest efficiency is obtained for slightly lower
temperatures and weaker system-bath coupling than those for optimal coherence
charging.
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