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Heat Modulation on Target Thermal Bath via Coherent Auxiliary Bath.

Wen-Li Yu¹, Tao Li², Hai Li²

¹School of Computer Science and Technology, Shandong Technology and Business University, Yantai 264000, China.

Entropy (Basel, Switzerland)

|September 28, 2021

Summary

Quantum coherence in an auxiliary bath enables precise control over heat current direction and magnitude in a three-qubit system. This quantum thermal management device acts as a heat amplifier, suppressor, switcher, or refrigerator.

Keywords:

coherent auxiliary bath heat current heat modulation multifunctional thermal device

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Area of Science:

Quantum thermodynamics
Quantum information science
Solid-state physics

Background:

Effective thermal management is crucial for quantum technologies.
Controlling heat flow at the quantum level presents significant challenges.
Quantum coherence offers a potential resource for novel thermal control mechanisms.

Purpose of the Study:

To investigate a thermal management scheme using a coherent auxiliary bath (CAB) for a target thermal bath (TTB).
To explore the role of quantum coherence in controlling heat current between a three-qubit system and a TTB.
To demonstrate the potential of CAB-assisted systems as multifunctional thermal devices.

Main Methods:

Utilizing a collision model framework to study the dynamics of a three-qubit system coupled to a CAB and TTB.
Modeling the CAB and TTB as ensembles of coherent and thermal two-level atoms (TLAs), respectively.
Analyzing the characteristics of the steady-state heat current (target heat current, THC).

Main Results:

The magnitude and direction of the THC can be controlled by adjusting the system-CAB coupling strength, leveraging quantum coherence.
The influence of ancilla coherence on THC is dependent on the system-CAB coupling strength.
THC correlates positively or negatively with ancilla coherence magnitude below or above a critical coupling value, respectively.
The system with CAB functions as a versatile thermal device (amplifier, suppressor, switcher, refrigerator), unlike a system with only a thermal auxiliary bath (suppressor only).

Conclusions:

Quantum coherence from a CAB is a powerful resource for manipulating heat currents.
The proposed system offers a novel approach to designing multifunctional quantum thermal devices.
This work opens new avenues for utilizing quantum effects in thermal management applications.