Quantum Thermodynamics of Open Quantum Systems: Nature of Thermal Fluctuations

TL;DR

This paper explores the thermodynamics of open quantum systems using the Hamiltonian of Mean Force, analyzing models like two-qubit systems and Jaynes-Cummings, revealing how environment influences quantum thermodynamic properties.

Contribution

It introduces a detailed analysis of quantum thermodynamics in open systems across different coupling regimes, emphasizing the role of environmental interactions.

Findings

Environmental interactions significantly affect thermodynamic quantities.

Energy-temperature uncertainty relation bounds signal-to-noise ratio.

Strong and weak coupling regimes exhibit distinct thermodynamic behaviors.

Abstract

We investigate the thermodynamic behavior of open quantum systems through the Hamiltonian of Mean Force, focusing on two models: a two-qubit system interacting with a thermal bath and a Jaynes-Cummings Model without the rotating wave approximation. By analyzing both weak and strong coupling regimes, we uncover the impact of environmental interactions on quantum thermodynamic quantities, including specific heat capacity, internal energy, and entropy. Further, the ergotropy and entropy production are computed. We also explore the energy-temperature uncertainty relation, which sets an upper bound on the signal-to-noise ratio.