Detuning effects for heat-current control in quantum thermal devices

Malavazi, André H. A.; Ahmadi, Borhan; Mazurek, Paweł; Mandarino, Antonio

doi:10.1103/physreve.109.064146

Phys. Rev. E

2024

DOI: 10.1103/physreve.109.064146

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Detuning effects for heat-current control in quantum thermal devices

André H. A. Malavazi,

Borhan Ahmadi,

Paweł Mazurek

et al.

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Cited by 2 publications

References 89 publications

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Improving quantum thermal transistors through feedback-controlled baths

Ekanayake,

Gunapala,

Premaratne

2024

APL Quantum

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In recent years, integrating quantum feedback mechanisms into thermal machines has gained attention due to its benefits in manipulating the system states and energy flows. This is particularly advantageous for quantum thermal transistors in preserving their inherent quantum properties as they lose the purity of the system states due to decoherence and relaxation from interactions with thermal baths, within the subsystems, and monitoring. In the literature, studies have demonstrated that preserving quantum coherence can enhance the performance of quantum thermal machines, improving their efficiency. In our paper, we present a model that proposes engineering baths to be equipped with detectors and a controller to enable feedback in a quantum thermal transistor that emulates a role played by a feedback resistor in an electronic transistor. We use the framework of quantum feedback control via weak monitoring. We modify the system evolution trajectories by using a weak monitoring record from a detector. By taking the ensemble average of these trajectories, we unveil the evolution of the system density matrix that corresponds to the Markovian dynamics of the transistor. This type of feedback introduces minimal perturbation to the system and, once tuned, enhances the system coherence that would otherwise degrade due to bath interactions. Furthermore, there will be no change in the relaxation times. The probabilities of population terms remain unchanged. We treat this an enhancement in the operational characteristics of the quantum thermal transistor as it maintains its quantum features with an added benefit of improved amplification capabilities.

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Improving quantum thermal transistors through feedback-controlled baths

Ekanayake,

Gunapala,

Premaratne

2024

APL Quantum

View full text Add to dashboard Cite

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Enhanced thermal rectification in coupled qutrit–qubit quantum thermal diode

Rajapaksha,

Gunapala,

Premaratne

2024

APL Quantum

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We present a quantum thermal diode model based on a coupled qutrit–qubit system designed to control heat flow between two thermal baths with unprecedented efficiency. This differs from previous models in terms of the asymmetry introduced by spin particles and their interaction. By exploiting the interactions between degenerate states within the coupled qutrit–qubit system, our model demonstrates diode-like behavior that is both robust and energy-efficient. Utilizing the frameworks of open quantum systems and the quantum Markovian master equation, with the Born and rotating wave approximations, we comprehensively analyze the system’s behavior. Numerical simulations reveal significant thermal rectification across a wide temperature range, positioning our model as a groundbreaking solution for nanoscale heat management. In addition, we employ state transition diagrams to elucidate the transition rate characteristics that underpin the diode behavior. Finally, we explore the potential for physical implementation using superconducting circuits, highlighting the practical relevance of our design.

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Detuning effects for heat-current control in quantum thermal devices

Cited by 2 publications

References 89 publications

Improving quantum thermal transistors through feedback-controlled baths

Improving quantum thermal transistors through feedback-controlled baths

Enhanced thermal rectification in coupled qutrit–qubit quantum thermal diode

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