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Durham Seminar, Friday 15 November 2019

12:00 - 13:00

CLC407

Gabriele de Chiara

Gabriele de Chiara

Out-of-equilibrium thermodynamics of small quantum systems

Abstract: The study of out-of-equilibrium quantum thermodynamics has received a significant thrust thanks to the experimental advances in the control and manipulation of microscopic systems. Work, heat and entropy, ubiquitous concepts in traditional thermodynamics, assume in this context the role of stochastic variables. Their fluctuations can be ingeniously related, through fluctuation theorems, to equilibrium properties, as is the case of the celebrated Jarzynski equality. In the first part of this talk, I will revise these concepts and discuss experimental schemes and realisations to directly measure work, heat and entropy in quantum systems (see for example [1]). In the second part of the seminar I will present designs of small quantum thermal machines using a few spins or harmonic oscillators. This is the ideal context to investigate the effects of quantum correlations, for example entanglement and discord, on the performance of such quantum engines [2-4]. References: [1] F. Binder, L. A. Correa, C. Gogolin, J. Anders, and G. Adesso (eds.), "Thermodynamics in the quantum regime - Recent Progress and Outlook", (Springer International Publishing) [2] Brendan Reid, Simon Pigeon, Mauro Antezza, Gabriele De Chiara, EPL 120, 60006 (2017) [3] Adam Hewgill, Alessandro Ferraro, Gabriele De Chiara, Phys. Rev. A 98, 042102 (2018) [4] Adam Hewgill, J. Onam González, José J. Palao, Daniel Alonso, Alessandro Ferraro, Gabriele De Chiara, arXiv:1910.01600