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Open AccessArticle

Measurement Based Quantum Heat Engine with Coupled Working Medium

by Arpan Das 1,2,3,* and Sibasish Ghosh 2,3
1
Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, Odisha, India
2
Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, India
3
Optics and Quantum Information Group, The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai 600113, India
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(11), 1131; https://doi.org/10.3390/e21111131
Received: 2 October 2019 / Revised: 29 October 2019 / Accepted: 31 October 2019 / Published: 19 November 2019
(This article belongs to the Section Thermodynamics)
We consider measurement based single temperature quantum heat engine without feedback control, introduced recently by Yi, Talkner and Kim [Phys. Rev. E 96, 022108 (2017)]. Taking the working medium of the engine to be a one-dimensional Heisenberg model of two spins, we calculate the efficiency of the engine undergoing a cyclic process. Starting with two spin-1/2 particles, we investigate the scenario of higher spins also. We show that, for this model of coupled working medium, efficiency can be higher than that of an uncoupled one. However, the relationship between the coupling constant and the efficiency of the engine is rather involved. We find that in the higher spin scenario efficiency can sometimes be negative (this means work has to be done to run the engine cycle) for certain range of coupling constants, in contrast to the aforesaid work of Yi, Talkner and Kim, where they showed that the extracted work is always positive in the absence of coupling. We provide arguments for this negative efficiency in higher spin scenarios. Interestingly, this happens only in the asymmetric scenarios, where the two spins are different. Given these facts, for judiciously chosen conditions, an engine with coupled working medium gives advantage for the efficiency over the uncoupled one. View Full-Text
Keywords: quantum heat engine; measurement driven engine quantum heat engine; measurement driven engine
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Das, A.; Ghosh, S. Measurement Based Quantum Heat Engine with Coupled Working Medium. Entropy 2019, 21, 1131.

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