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A three-level system attached to three thermal baths is manipulated to be amicroscopic thermal device integrating a valve, a refrigerator, an amplifier,and a thermometer in the quantum regime, via tuning the inner coupling strengthof the system and the temperatures of the external baths. We discuss the roleof the inner coupling as well as the steady-state quantum coherence in thesethermal functions using the Redfield master equation under a partial secularapproximation. A high-sensitive thermometer for the low-temperature terminalcan be established without the assistance from the inner coupling of thesystem. Our study of this multifunctional thermal device provides a deeperinsight to the underlying quantum thermodynamics associated with the quantumcoherence.

A multifunctional quantum thermal device: with and without inner coupling