# Quantum Heat Engines and Refrigerators

When |
May 27, 2019
from 11:00 AM to 12:00 PM |
---|---|

Where | Amphi. Schrödinger |

Attendees |
Michele Campisi |

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I will begin showing that heat engines and refrigerators can be understood as a driven bipartite quantum system. I will then illustrate that a fluctuation theorem (the so called heat engine fluctuation relation or HEFR) holds for such system [1]. Fluctuation theorems are exact relations in non-equilibrium thermodynamics that are obeyed by the statistics of work and heat (which are indeed stochastic variables) [2]. The second law of thermodynamics in both Carnot and Kelvin formulation can be quickly derived from the HEFR, and as well in the formulation according to which heat spontaneously flows from hot to cold. I will then illustrate a possible experimental realisation of quantum heat engine/refrigerator with superconducting qubits, and illustrate its functioning [3]. If time will allow I will discuss the intriguing fact that quantum measurements, because of their invasiveness, can be used to fuel a quantum mechanical refrigerator [4].

[1] M. Campisi, Fluctuation relation for quantum heat engines and refrigerators, J. Phys A: Math Theor 47, 245001 (2014)

[2] M. Campisi, P. Hänggi, and P. Talkner, Colloquium. Quantum Fluctuation Relations: Foundations and Applications, Rev. Mod. Phys. 83 , 771 (2011)

[3] M. Campisi, J. Pekola, R. Fazio, Nonequilibrium fluctuations in quantum heat engines: Theory, example, and possible solid state experiments, New J. Phys.17 0350 (2015)

[4] L. Buffoni, A. Solfanelli, P. Verrucchi, A. Cuccoli, M. Campisi, Quantum Measurement Cooling, Phys. Rev. Lett. 122 070603 (2019)