Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Quantum Effects

Q 55.2: Talk

Thursday, March 8, 2018, 11:00–11:15, K 1.013

Geometric phase in a quantum heat engine prototype — Sajal Kumar Giri and •Himangshu Prabal Goswami — Max-Planck-Institute for the Physics of Complex Systems, Dresden

We theoretically study a 4-level quantum system coupled to two thermal baths and a unimodal cavity which serves as a quantum heat engine prototype. By periodically modulating the temperature of the thermal baths in an adiabatic fashion, one can realize geometric or Pancharatnam-Berry phaselike (PBp) contributions identifiable from a full counting statistical method. Through the PBp contributions, the effect of quantum coherences in optimizing the total flux can be nullified. The PBp effects cause the universality in the expansion co-efficient (1/2) and the universal bounds on the efficiency at maximum power as well as the Gallvotti-Cohen type of symmetry to be violated. We further observe a seeming inapplicability in the use of a standard large deviation technique to evaluate the cavity photon-flux probability distribution function.