3 papers
quant-ph2020
Universal two-level quantum Otto machine under a squeezed reservoir
Rogério J. de Assis, José S. Sales, Jefferson A. R. da Cunha +1
We study an Otto heat machine whose working substance is a single two-level system interacting with a cold thermal reservoir and with a squeezed hot thermal reservoir. By adjusting…
quant-ph2018
Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
Rogério J. de Assis, Taysa M. de Mendonça, Celso J. Villas-Boas +4
Abstract We perform an experiment in which a quantum heat engine works under two reservoirs, one at a positive spin temperature and the other at an effective negative spin temperat…
quant-ph2018
Feasible platform to study negative temperatures
R. J. de Assis, C. J. Villas-Boas, N. G. de Almeida
We afford an experimentally feasible platform to study Boltzmann negative temperatures. Our proposal takes advantage of well-known techniques of engineering Hamiltonian to achieve…