A multifunctional quantum thermal device: With and without inner coupling

A three-level system attached to three thermal baths is manipulated be a microscopic device integrating valve, refrigerator, an amplifier, and thermometer in the quantum regime, via tuning inner coupling strength of temperatures external baths. We discuss role as well steady-state coherence these functions using Redfield master equation under partial secular approximation. high-sensitive for low-temperature terminal can established without assistance from system. Our study this multifunctional provides deeper insight underlying thermodynamics associated with coherence.