Oscillating Entropy and Spin Precession in the Ensemble of Qubits Interacting with Thermal Systems

TL;DR

This paper introduces a model explaining oscillating entropy in qubits interacting with thermal systems, attributing entropy oscillations to spin precession, and providing insights into quantum thermodynamics.

Contribution

It presents a simple model linking entropy oscillations to spin precession in qubits interacting with thermal environments, advancing understanding of quantum entropy dynamics.

Findings

Entropy oscillates between zero and thermal entropy values.

Entropy oscillations are explained by spin precession.

Model clarifies physical nature of entropy oscillations.

Abstract

We present a simple model which allows us to explain the physical nature of the oscillating entropy. We consider an ensemble of qubits interacting with thermal two-level systems. The entropy of the qubits oscillates between zero and the value of entropy of the thermal systems. We show that the oscillations of the entropy can be clearly explained by the precession of the real or effective spins of the qubits.