Supremacy of incoherent sudden cycles

Pekola, Jukka P.; Karimi, Bayan; Thomas, George; Averin, D. V.

doi:10.1103/physrevb.100.085405

Cited by 39 publications

(45 citation statements)

References 40 publications

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“…On the other hand, coherences built up during a cycle of a quantum heat engine are found to induce universal power losses in the linear response regime [18]. Similar result has also been reported in some specific models [19,20], where coherent oscillations are found in the output power and efficiency, leading to smaller values compared to their classical counter parts.…”

Section: Introductionsupporting

confidence: 80%

Speeding up a quantum refrigerator via counterdiabatic driving

et al. 2019

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We study the application of a counter-diabatic driving (CD) technique to enhance the thermodynamic efficiency and power of a quantum Otto refrigerator based on a superconducting qubit coupled to two resonant circuits. Although the CD technique is originally designed to counteract non-adiabatic coherent excitations in isolated systems, we find that it also works effectively in the open system dynamics, improving the coherence-induced losses of efficiency and power. We compare the CD dynamics with its classical counterpart, and find a deviation that arises because the CD is designed to follow the energy eigenbasis of the original Hamiltonian, but the heat baths thermalize the system in a different basis. We also discuss possible experimental realizations of our model.

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Section: Introductionsupporting

confidence: 80%

Speeding up a quantum refrigerator via counterdiabatic driving

et al. 2019

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“…A more complete definition of Equation ( 14 ) can be found in Refs. [ 29 , 30 , 31 , 32 , 33 , 46 ].…”

Section: First Law Of Thermodynamics and The Quantum And Classicalmentioning

confidence: 99%

“…In this framework, several recent studies have focused on employing quantum coherence in the working fluid for enhancing the performance of the engine [ 42 , 43 , 44 ]. Recently, an interesting regime called “sudden cycles” [ 45 ] has been explored in an incoherent formulation avoiding off-diagonal elements of the density matrix, characterized by finite cooling power [ 46 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Otto Engine for an Electron in a Quantum Dot: Classical and Quantum Approach

Peña

Negrete

Barrios

et al. 2019

Entropy

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We studied the performance of classical and quantum magnetic Otto cycle with a working substance composed of a single quantum dot using the Fock–Darwin model with the inclusion of the Zeeman interaction. Modulating an external/perpendicular magnetic field, in the classical approach, we found an oscillating behavior in the total work extracted that was not present in the quantum formulation.We found that, in the classical approach, the engine yielded a greater performance in terms of total work extracted and efficiency than when compared with the quantum approach. This is because, in the classical case, the working substance can be in thermal equilibrium at each point of the cycle, which maximizes the energy extracted in the adiabatic strokes.

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“…Our bounds on entropy production (34) and 43imply a whole family of trade-off relations between power and efficiency, which we derive in two steps. In the first one, we obtain a simple relation, which depends on the second singlejump moment of the effective thermal input and allows us to recover two earlier results.…”

Section: E Performance Bounds For Quantum Heat Enginesmentioning

confidence: 99%

“…Recent investigations include the study of generalized cycles, which involve continuous temperature variations [11][12][13][14][15], the development of optimal control strategies [16][17][18][19][20][21][22][23][24], and the systematic investigation of the thermodynamic footprint of quantum effects, which become relevant at time and energy scales comparable to Planck's constant, see for instance Refs. [25][26][27][28][29][30][31][32][33][34][35][36]. As a key result, this development led to the discovery of a family of trade-off relations between power, i.e., average work output per unit time, and efficiency, first in linear response [11,13,37] and then beyond [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Quantum jump approach to microscopic heat engines

Menczel

Flindt

Brandner

2020

Phys. Rev. Research

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Modern technologies could soon make it possible to investigate the operation cycles of quantum heat engines by counting the photons that are emitted and absorbed by their working systems. Using the quantum jump approach to open-system dynamics, we show that such experiments would give access to a set of observables that determine the trade-off between power and efficiency in finite-time engine cycles. By analyzing the single-jump statistics of thermodynamic fluxes such as heat and entropy production, we obtain a family of general bounds on the power of microscopic heat engines. Our new bounds unify two earlier results and admit a transparent physical interpretation in terms of single-photon measurements. In addition, these bounds confirm that driving-induced coherence leads to an increase in dissipation that suppresses the efficiency of slowly driven quantum engines in the weak-coupling regime. A nanoscale heat engine based on a superconducting qubit serves as an experimentally relevant example and a guiding paradigm for the development of our theory.

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Supremacy of incoherent sudden cycles

Cited by 39 publications

References 40 publications

Speeding up a quantum refrigerator via counterdiabatic driving

Speeding up a quantum refrigerator via counterdiabatic driving

Magnetic Otto Engine for an Electron in a Quantum Dot: Classical and Quantum Approach

Quantum jump approach to microscopic heat engines

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