A quantum Otto-type heat engine with fixed frequency
- URL: http://arxiv.org/abs/2311.13999v1
- Date: Thu, 23 Nov 2023 13:34:06 GMT
- Title: A quantum Otto-type heat engine with fixed frequency
- Authors: Richard Q. Matos, Rogerio J. de Assis, and Norton G. de Almeida
- Abstract summary: We analyze an Otto-type cycle operating with a working substance composed of a quantum harmonic oscillator (QHO)
We investigate the role of the squeezing parameter in our Otto-type engine powered by parametric pumping and show that it is possible to reach the Carnot limit by arbitrarily increasing the squeezing parameter.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this work, we analyze an Otto-type cycle operating with a working
substance composed of a quantum harmonic oscillator (QHO). Unlike other studies
in which the work extraction is done by varying the frequency of the QHO and
letting it thermalize with a squeezed reservoir, here we submit the QHO to a
parametric pumping controlled by the squeezing parameter and let it thermalize
with a thermal reservoir. We then investigate the role of the squeezing
parameter in our Otto-type engine powered by parametric pumping and show that
it is possible to reach the Carnot limit by arbitrarily increasing the
squeezing parameter. Notably, for certain squeezing parameters $r$, e.g.
$r=0.4$, the quasi-static Otto limit can be reached even at non-zero power. We
also investigated the role of entropy production in the efficiency behavior
during the unitary strokes, showing that positive (negative) changes in entropy
production correspond to increases (decreases) in engine efficiency, as
expected. Furthermore, we show that under thermal reservoirs a work extraction
process that is more efficient than the Carnot engine is impossible, regardless
of the quantum resource introduced via the Hamiltonian of the system.
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