@article {edselc.2-52.0-8496449498520160401,
	title = {Quantum heat machines equivalence, work extraction beyond markovianity, and strong coupling via heat exchangers},
	journal = {Entropy},
	volume = {18},
	year = {2016},
	pages = {124},
	abstract = {Various engine types are thermodynamically equivalent in the quantum limit of small {\textquotedblleft}engine action{\textquotedblright}. Our previous derivation of the equivalence is restricted to Markovian heat baths and to implicit classical work repository (e.g., laser light in the semi-classical approximation). In this paper, all the components, baths, batteries, and engines, are explicitly taken into account. To neatly treat non-Markovian dynamics, we use mediating particles that function as a heat exchanger. We find that, on top of the previously observed equivalence, there is a higher degree of equivalence that cannot be achieved in the Markovian regime. Next, we focus on the quality of the battery charging process. A condition for positive energy increase and zero entropy increase (work) is given. Moreover, it is shown that, in the strong coupling regime, it is possible to super-charge a battery. With super-charging, the energy of the battery is increased while its entropy is being reduced at the same time.},
	keywords = {Engine equivalence, Four-stroke, Heat exchanger, Non-Markovian, Quantum heat engines, Quantum refrigerators, quantum thermodynamics, Strong coupling, Two-stroke},
	issn = {10994300},
	url = {http://www.mdpi.com/1099-4300/18/4/124/htm},
	author = {Uzdin, R. and Levy, A. and Kosloff, R.}
}
