Nonequilibrium quantum absorption refrigerator

Du, Jianying; Zhang, Fu-Lin

doi:10.1088/1367-2630/aac688

Cited by 24 publications

(16 citation statements)

References 37 publications

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“…In quantum thermodynamics, one of the timely questions is whether and under what conditions quantum features such as entanglement and coherence can enhance the performance of heat engines and refrigerators [1][2][3]. In many models of such machines, quantum coherence is found to be useful [4][5][6][7][8][9][10][11], whereas its adverse effect has also been reported [12][13][14][15][16] or its usefulness may even depend on the quantity of interest [17]. An interesting regime is given by sudden cycles where control parameters of the system change infinitely rapidly.…”

Section: Introductionmentioning

confidence: 99%

Supremacy of incoherent sudden cycles

et al. 2019

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We investigate theoretically a refrigerator based on a two-level system (TLS) coupled alternately to two different heat baths. Modulation of the coupling is achieved by tuning the level spacing of the TLS. We find that the TLS, which avoids quantum coherences, creates finite cooling power for one of the baths in sudden cycles, i.e. acts as a refrigerator even in the limit of infinite operation frequency. By contrast, the cycles that create quantum coherence in the sudden expansions and compressions lead to heating of both the baths. We propose a driving method that avoids creating coherence and thus restores the cooling in this system. We also discuss a physical realization of the cycle based on a superconducting qubit coupled to dissipative LC-resonators.

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Section: Introductionmentioning

confidence: 99%

Supremacy of incoherent sudden cycles

et al. 2019

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“…It is important to note that the authors in Refs. [37,42] investigated the heat transfer in the model of quantum refrigerators and the consistency of thermodynamic laws, as shown in Fig. 6(c), where the heat current Q 1 is determined by…”

Section: Discussionmentioning

confidence: 99%

“…where i denotes the dissipation rate and is related to the spectral density of the bath; σ + 1 = |1 0| and σ − 1 = |0 1| are the creation and annihilation operators of qubit 1, respectively; [37,43], each qubit is assumed to be described by the Boltzmann distribution. In this work, we study the irreversibile heat transfer between the bosonic baths.…”

Section: Model and Theorymentioning

confidence: 99%

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Quantum-dot heat engines with irreversible heat transfer

Shen

Zhang

et al. 2020

Phys. Rev. Research

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We study an endoreversible quantum heat engine in which the heat transfer between the baths is mediated by two qubits. Each qubit acts as an energy filter which allows for the conversion of heat into work. The relation between the efficiency and the power output is derived. It is found that the efficiency of the quantum heat engine at the maximum power output is closely dependent on the properties of quantum dots and does not equal the Curzon-Alhborn efficiency, which is only a function of the bath temperatures. The efficiency and the power output may be adjusted through qubit energy levels. It is further shown that in the limiting cases of small energy levels (or high temperatures) and small temperature differences, the quantum heat engine converges to the classical endoreversible Carnot heat engine.

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“…Most studies focus on autonomous machines involving three thermal baths, sometimes called absorption refrigerators ( Fig. 1, panel b), where one of the bath plays the role of the energy source of the machine [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49].…”

mentioning

confidence: 99%

Quantum coherence, many-body correlations, and non-thermal effects for autonomous thermal machines

Latune

Sinayskiy

Petruccione

2019

Sci Rep

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One of the principal objectives of quantum thermodynamics is to explore quantum effects and their potential beneficial role in thermodynamic tasks like work extraction or refrigeration. So far, even though several papers have already shown that quantum effect could indeed bring quantum advantages, a global and deeper understanding is still lacking. Here, we extend previous models of autonomous machines to include quantum batteries made of arbitrary systems of discrete spectrum. We establish their actual efficiency, which allows us to derive an efficiency upper bound, called maximal achievable efficiency, shown to be always achievable, in contrast with previous upper bounds based only on the Second Law. Such maximal achievable efficiency can be expressed simply in term of the apparent temperature of the quantum battery. This important result appears to be a powerful tool to understand how quantum features like coherence but also many-body correlations and non-thermal population distribution can be harnessed to increase the efficiency of thermal machines.

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Nonequilibrium quantum absorption refrigerator

Cited by 24 publications

References 37 publications

Supremacy of incoherent sudden cycles

Supremacy of incoherent sudden cycles

Quantum-dot heat engines with irreversible heat transfer

Quantum coherence, many-body correlations, and non-thermal effects for autonomous thermal machines

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