Quantum thermodynamics in chiral two--level systems. The quantum stochastic resonance

TL;DR

This paper develops a Langevin-based quantum thermodynamics framework for chiral two-level systems, focusing on quantum stochastic resonance as a cooperative effect of noise, friction, and periodic driving.

Contribution

It introduces a novel stochastic dynamics approach different from the spin-boson model to analyze quantum thermodynamics in chiral systems.

Findings

Quantum stochastic resonance observed in bistable systems.

Energy and heat capacity can be derived from the stochastic dynamics.

Highlights the role of noise and friction in quantum thermodynamics.

Abstract

A Langevin canonical framework for a chiral two-level system coupled to a bath of harmonic oscillators is used within a coupling scheme different from the well-known spin-boson model. From this stochastic dynamics, within the Markovian regime and Ohmic friction, some standard quantum thermodynamics functions such as the energy average and heat capacity can be extracted. In particular, special emphasis is put on the so-called quantum stochastic resonance which is a cooperative effect of friction, noise and periodic driving occurring in a bistable system.