Zobrazeno 1 - 10
of 52
pro vyhledávání: '"de Almeida, Norton G."'
Quantum heat machines, encompassing heat engines, refrigerators, heaters, and accelerators, represent the forefront of quantum thermodynamics, offering a novel paradigm for converting heat energy into useful mechanical work. Leveraging quantum mechan
Externí odkaz:
http://arxiv.org/abs/2407.09027
Cyclic classical and quantum thermal machines show higher efficiency when the strokes are carried out quasi-statically. Recent theoretical and experimental work on figures of merit for thermal machines show that they have an advantage when operating
Externí odkaz:
http://arxiv.org/abs/2404.02385
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
In this paper we study a quantum Otto thermal machine where the working substance is composed of N identical qubits coupled to a single mode of a bosonic field, where the atoms and the field interact with a reservoir, as described by the so-called op
Externí odkaz:
http://arxiv.org/abs/2308.06664
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 analyze the new redefinitions of heat Q and work W recently presented in [arXiv: 1912.01939; arXiv:1912.01983v5] in the quantum thermodynamics domain. According to these redefinitions, heat must be associated with the variation of entropy, while w
Externí odkaz:
http://arxiv.org/abs/2107.03369
We study the effect of Kerr nonlinearity in quantum thermal machines having a Kerr-nonlinear oscillator as working substance and operating under the ideal quantum Otto cycle. We first investigate the efficiency of a Kerr-nonlinear heat engine and sho
Externí odkaz:
http://arxiv.org/abs/2105.09475
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