Unified trade-off optimization of quantum harmonic Otto engine and refrigerator

Singh, Varinder; Singh, Satnam; Abah, Obinna; Müstecaplıoğlu, Özgür E.

doi:10.1103/physreve.106.024137

Cited by 14 publications

(8 citation statements)

References 77 publications

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“…We can choose a suitable strategy depending on a purpose (a higher polarization or faster cooling). The similar trade-off relationships were discussed for a cyclic discrete quantum refrigerator [40][41][42][43][44][45] , whereas we show such a trade-off relation about a continuous cooling scheme. Note also that Fig.…”

Section: Trade-off Relationssupporting

confidence: 78%

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane

Kamimura

Kukita

et al. 2023

Preprint

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We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal energyof its environment. We consider two types of quantum refrigerators: (1) one extra qubit with frequent pulse operations and(2) two extra qubits without them. These two types of refrigerators are evaluated from the viewpoint of quantum thermodynamics. More specifically,we calculate the heat removed from the target qubit, the work done for the system, and the coefficient of performance (COP), the ratio between the heat ant work.We show that the COP of the second type outperforms that of the first one.Our results are useful to design a high-performance quantum refrigerator cooling down a qubit.

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Section: Trade-off Relationssupporting

confidence: 78%

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane

Kamimura

Kukita

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…We can choose a suitable strategy, depending on a purpose. Although similar trade-off relationships were discussed for a cyclic discrete quantum refrigerator [39][40][41][42][43][44], we show such a trade-off relationship about a continuous cooling scheme to polarize a spin. These results show that, due to the extra cost of the initialization of Qubit 2, the COP of Refrigerator I becomes worse than that of Refrigerator II, COP I < COP II .…”

Section: Trade-off Relationssupporting

confidence: 68%

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Okane¹,

Kamimura²,

Kukita³

et al. 2022

Preprint

View full text Add to dashboard Cite

We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal energy of the environment. We consider two types of quantum refrigerators: (1) one extra qubit with frequent pulse operations and (2) two extra qubits without them. These two types of refrigerators are evaluated from the viewpoint of quantum thermodynamics. More specifically, we calculate the heat removed from the target qubit, the work done for the system, and the coefficient of performance (COP), the ratio between the heat ant the work. We show that the COP of the second type outperforms that of the first type. Our results are useful to design a high-performance quantum refrigerator cooling down a qubit.

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“…The terms Q * 12 and Q * 34 are the adiabaticity parameters and their values depend on the driving scheme [70]. We are employing a sign convention in which all the incoming fluxes (heat and work) are taken to be positive [35,88].…”

Section: Quantum Harmonic Otto Cyclementioning

confidence: 99%

A quantum Otto engine with shortcuts to thermalization and adiabaticity

Pedram,

Kadıoğlu,

Kabakçıoğlu

et al. 2023

New J. Phys.

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We investigate the energetic advantage of accelerating a quantum harmonic oscillator Otto engine by use of shortcuts to adiabaticity (for the expansion and compression strokes) and to equilibrium (for the hot isochore), by means of counter-diabatic (CD) driving. By comparing various protocols with and without CD driving, we find that, applying both type of shortcuts leads to enhanced power and efficiency even after the driving costs are taken into account. The hybrid protocol not only retains its advantage in the limit cycle, but also recovers engine functionality (i.e. a positive power output) in parameter regimes where an uncontrolled, finite-time Otto cycle fails. We show that controlling three strokes of the cycle leads to an overall improvement of the performance metrics compared with controlling only the two adiabatic strokes. Moreover, we numerically calculate the limit cycle behavior of the engine and show that the engines with accelerated isochoric and adiabatic strokes display a superior power output in this mode of operation.

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Unified trade-off optimization of quantum harmonic Otto engine and refrigerator

Cited by 14 publications

References 77 publications

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit

A quantum Otto engine with shortcuts to thermalization and adiabaticity

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