Quantum thermodynamic cooling cycle

Palao, José P.; Kosloff, Ronnie; Gordon, Jeffrey M.

doi:10.1103/physreve.64.056130

Cited by 145 publications

(153 citation statements)

References 18 publications

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“…Similar abstract models of this nature were proposed before by Kosloff and coworkers [12,13,14,15]. Here we consider a specific, realizable, model of a molecular level heat pump based on modulation of molecular energy levels.…”

Section: Introductionmentioning

confidence: 76%

Molecular heat pump

2006

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We propose a novel molecular device that pumps heat against a thermal gradient. The system consists of a molecular element connecting two thermal reservoirs that are characterized by different spectral properties. The pumping action is achieved by applying an external force that periodically modulates molecular levels. This modulation affects periodic oscillations of the internal temperature of the molecule and the strength of its coupling to each reservoir resulting in a net heat flow in the desired direction. The heat flow is examined in the slow and fast modulation limits and for different modulation waveforms, thus making it possible to optimize the device performance.

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Section: Introductionmentioning

confidence: 76%

Molecular heat pump

2006

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“…One may compute the energy currentsQ α ∈ {w,h,c} flowing from each of the heat baths into the system from its (nonequilibrium) steady state (∞) [17]. Provided that…”

Section: The Four-level Chillermentioning

confidence: 99%

“…That is, net heat is extracted from the cold bath at temperature T c and dumped into the hot bath at T h , with the assistance of extra energy coming from the work bath at T w . This realizes a quantum absorption chiller [17,18]. Unless ω c = ω c,rev the operation of the chiller is always irreversible, meaning that the total entropy production ∆S ≡ −Q w /T w −Q h /T h −Q c /T c > 0 is strictly positive.…”

Section: The Four-level Chillermentioning

confidence: 99%

“…Interestingly, a weakly driven three-level maser is, in good approximation, endoreversible [16], while a three-level absorption chiller or heat transformer (i.e. driven by heat rather than work) [17,18] is strictly so. The optimization of this model has been thoroughly studied so as to establish universal endoreversible performance bounds from a full microscopic description of the system-baths interactions [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Internal dissipation and heat leaks in quantum thermodynamic cycles

2015

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The direction of the steady-state heat currents across a generic quantum system connected to multiple baths may be engineered so as to realize virtually any thermodynamic cycle. In spite of their versatility such continuous energy-conversion systems are generally unable to operate at maximum efficiency due to non-negligible sources of irreversible entropy production. In this paper we introduce a minimal model of irreversible absorption chiller. We identify and characterize the different mechanisms responsible for its irreversibility, namely heat leaks and internal dissipation, and gauge their relative impact in the overall cooling performance. We also propose reservoir engineering techniques to minimize these detrimental effects. Finally, by looking into a known three-qubit embodiment of the absorption cooling cycle, we illustrate how our simple model may help to pinpoint the different sources of irreversibility naturally arising in more complex practical heat devices.

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“…Different kinds of models like machines built of harmonic oscillators, of uncoupled spins, particles in a potential or different three level systems have been studied [4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Driven spin systems as quantum thermodynamic machines: Fundamental limits

2007

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We show that coupled two level systems like qubits studied in quantum information can be used as a thermodynamic machine. At least three qubits or spins are necessary and arranged in a chain. The system is interfaced between two split baths and the working spin in the middle is externally driven. The machine performs Carnot-type cycles and is able to work as heat pump or engine depending on the temperature difference of the baths ∆T and the energy differences in the spin system ∆E. It can be shown that the efficiency is a function of ∆T and ∆E.

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Quantum thermodynamic cooling cycle

Cited by 145 publications

References 18 publications

Molecular heat pump

Molecular heat pump

Internal dissipation and heat leaks in quantum thermodynamic cycles

Driven spin systems as quantum thermodynamic machines: Fundamental limits

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