Quantum Thermal Amplifiers with Engineered Dissipation

TL;DR

This paper investigates how engineered dissipation in a three-qubit quantum system can enhance heat current amplification, providing insights into optimizing quantum thermal transistors through reservoir engineering and quantum correlations.

Contribution

It introduces a quantum dynamical framework to analyze the impact of tailored thermal baths on heat amplification in quantum thermal transistors, highlighting the role of dissipation engineering.

Findings

Engineered thermal reservoirs can significantly increase amplification gain.

Quantum correlations influence the effectiveness of heat current amplification.

Different dissipative configurations yield varying levels of transistor performance.

Abstract

A three-terminal device, able to control the heat currents flowing through it, is known as a quantum thermal transistor whenever it amplifies two output currents as a response to the external source acting on its third terminal. Several efforts have been proposed in the direction of addressing different engineering options of the configuration of the system. Here, we adhere to the scheme in which such a device is implemented as a three-qubit system that interacts with three separate thermal baths. However, another interesting direction is how to engineer the thermal reservoirs to magnify the current amplification. Here, we derive a quantum dynamical equation for the evolution of the system to study the role of distinct dissipative thermal noises. We compare the amplification gain in different configurations and analyze the role of the correlations in a system exhibiting the thermal transistor effect, via measures borrowed from the quantum information theory.