Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Assis, A. J."'
Publikováno v:
Phys. Rev. E 108, 054131 (2023)
In this work, we analyze an Otto-type cycle operating with a working substance composed of a quantum harmonic oscillator (QHO). Unlike other studies in which the work extraction is done by varying the frequency of the QHO and letting it thermalize wi
Externí odkaz:
http://arxiv.org/abs/2311.13999
Publikováno v:
Phys. Rev. A 108, 052605 (2023)
Many quantum algorithms demand a large number of repetitions to obtain reliable statistical results. Thus, at each repetition it is necessary to reset the qubits efficiently and precisely in the shortest possible time, so that quantum computers actua
Externí odkaz:
http://arxiv.org/abs/2304.00684
Recently, much emphasis has been given to genuinely quantum reservoirs generically called fermionic reservoirs. These reservoirs are characterized by having finite levels, as opposed to bosonic reservoirs, which have infinite levels that can be popul
Externí odkaz:
http://arxiv.org/abs/2207.08862
In this work, we study an autonomous refrigerator composed of three qubits [Phys. Rev. Lett. 105, 130401 (2010)] operating with one of the reservoirs at negative temperatures, which has the purpose of cooling one of the qubits. We find the values of
Externí odkaz:
http://arxiv.org/abs/2204.09479
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 the squeezing or the adiabaticity parameter (the probability of trans
Externí odkaz:
http://arxiv.org/abs/2006.14704
Recent theoretical and experimental studies in quantum heat engines show that, in the quasi-static regime, it is possible to have higher efficiency than the limit imposed by Carnot, provided that engineered reservoirs are used. The quasi-static regim
Externí odkaz:
http://arxiv.org/abs/2003.12664
Autor:
Mendonça, Taysa M., Martins, Alexandre M., de Assis, Rogério J., de Almeida, Norton G., Sarthour, Roberto S., de Oliveira, Ivan S., Villas-boas, Celso J.
Publikováno v:
Phys. Rev. Research 2, 043419 (2020)
Abstract Reservoir engineering is an important tool for quantum information science and quantum thermodynamics since it allows for preparing and/or protecting special quantum states of single or multipartite systems or to investigate fundamental ques
Externí odkaz:
http://arxiv.org/abs/2001.10127
Autor:
Ribeiro, P. H. Souto, Häffner, T., Zanin, G. L., da Silva, N. Rubiano, de Araújo, R. Medeiros, Silva, W. C. S., de Assis, R. J., Céleri, L. C., Forbes, A.
Publikováno v:
Phys. Rev. A 101, 052113 (2020)
Optical modes possessing orbital angular momentum constitute a very useful platform for experimental studies on the quantum limits of Thermodynamics. Here, we present experimental results for entangled photon pairs subjected to thin turbulence simula
Externí odkaz:
http://arxiv.org/abs/1912.06447
Autor:
de Assis, Rogério J., de Mendonça, Taysa M., Villas-Boas, Celso J., de Souza, Alexandre M., Sarthour, Roberto S., Oliveira, Ivan S., de Almeida, Norton G.
Publikováno v:
Phys. Rev. Lett. 122, 240602 (2019)
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 temperature i.e., when the spin system presents population inversion. We show
Externí odkaz:
http://arxiv.org/abs/1811.02917
We afford an experimentally feasible platform to study Boltzmann negative temperatures. Our proposal takes advantage of well-known techniques of engineering Hamiltonian to achieve steady states with highly controllable population inversion. Our model
Externí odkaz:
http://arxiv.org/abs/1805.09936