Isolated Quantum Heat Engine

Fialko, O.; Hallwood, David W.

doi:10.1103/physrevlett.108.085303

Cited by 107 publications

(101 citation statements)

References 24 publications

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“…Suggestions for realizations in several other quantum systems include quantum dots [47,48], superconducting devices [49][50][51][52], cold bosons [53], and optomechanical systems [34,54,55]. For other related experiments and their theoretical studies, see [56][57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Quantum Heat Machines Equivalence, Work Extraction beyond Markovianity, and Strong Coupling via Heat Exchangers

Uzdin

Levy

Kosloff

2016

Entropy

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Various engine types are thermodynamically equivalent in the quantum limit of small "engine action". Our previous derivation of the equivalence is restricted to Markovian heat baths and to implicit classical work repository (e.g., laser light in the semi-classical approximation). In this paper, all the components, baths, batteries, and engines, are explicitly taken into account. To neatly treat non-Markovian dynamics, we use mediating particles that function as a heat exchanger. We find that, on top of the previously observed equivalence, there is a higher degree of equivalence that cannot be achieved in the Markovian regime. Next, we focus on the quality of the battery charging process. A condition for positive energy increase and zero entropy increase (work) is given. Moreover, it is shown that, in the strong coupling regime, it is possible to super-charge a battery. With super-charging, the energy of the battery is increased while its entropy is being reduced at the same time.

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Section: Introductionmentioning

confidence: 99%

Quantum Heat Machines Equivalence, Work Extraction beyond Markovianity, and Strong Coupling via Heat Exchangers

Uzdin

Levy

Kosloff

2016

Entropy

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“…In the quantum adiabatic limit, the average work produced by polariton A during stroke 3 is (6) whereρ(x 1 ) are the steady-state density matrix of the system andn A (x 1 ) the population of polariton A at x = x 1 , and similarly for W 3B with A → B. The work produced during that stroke is W 3 = W 3B + W 3A , and its variance Var[…”

Section: Output Work and Correlationmentioning

confidence: 99%

“…This development has benefited in particular from emerging experimental technologies in AMO and NEMS systems, as evidenced in particular by the single ion heat engine theoretically proposed [1] and experimentally demonstrated [2]. Additional approaches being considered involve spin systems [3,4], qubit systems [5], ultracold atoms [6], cavity-assisted atom-light systems [7], nanomechanical resonators [8], and optomechanical systems [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Deep-subwavelength lithography via graphene plasmons

2017

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We propose a realization of a quantum heat engine in a hybrid microwave-optomechanical system that is the analog of a classical straight-twin engine. It exploits a pair of polariton modes that operate as out-of-phase quantum Otto cycles. A third polariton mode that is essential in the coupling of the optical and microwave fields is maintained in a quasi-dark mode to suppress disturbances from the mechanical noise. We also find that the fluctuations in the contributions to the total work from the two polariton modes are characterized by quantum correlations that generally lead to a reduction in the extractable work compared to its classical version.

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“…For a machine using a classical working medium on the verge of a phase transition, a boost in the efficiency has been predicted [23]. On the other hand the study of many-body quantum heat-engines is still at its infancy [24][25][26][27], and we need to understand whether a manybody quantum system can give an improvement in this respect as compared to a sequence of many heat-engines each operating with a single particle. Thus it is timely to proceed towards a systematic study of such devices.…”

Section: Introductionmentioning

confidence: 99%

Work extraction and energy storage in the Dicke model

2016

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We study work extraction from the Dicke model achieved using simple unitary cyclic transformations keeping into account both a non optimal unitary protocol, and the energetic cost of creating the initial state. By analyzing the role of entanglement, we find that highly entangled states can be inefficient for energy storage when considering the energetic cost of creating the state. Such surprising result holds notwithstanding the fact that the criticality of the model at hand can sensibly improve the extraction of work. While showing the advantages of using a many-body system for work extraction, our results demonstrate that entanglement is not necessarily advantageous for energy storage purposes, when non optimal processes are considered. Our work shows the importance of better understanding the complex interconnections between non-equilibrium thermodynamics of quantum systems and correlations among their subparts.

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Isolated Quantum Heat Engine

Cited by 107 publications

References 24 publications

Quantum Heat Machines Equivalence, Work Extraction beyond Markovianity, and Strong Coupling via Heat Exchangers

Quantum Heat Machines Equivalence, Work Extraction beyond Markovianity, and Strong Coupling via Heat Exchangers

Deep-subwavelength lithography via graphene plasmons

Work extraction and energy storage in the Dicke model

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