Landauer's principle in Qubit-Cavity quantum field theory Interaction in Vacuum and Thermal States

TL;DR

This paper investigates Landauer's principle within qubit-cavity quantum field theory interactions, analyzing heat exchange and entropy changes in vacuum and thermal states, confirming the principle's validity in these quantum scenarios.

Contribution

It extends Landauer's principle to quantum field theory interactions, considering vacuum and thermal states, and explores effects of acceleration and higher-order perturbations.

Findings

Landauer's principle holds in qubit-cavity QFT interactions.

Vacuum states cause the QFT to absorb heat and excite.

Thermal states can both absorb and release heat depending on conditions.

Abstract

Landauer's principle has seen a boom of interest in the last few years due to the growing interest in quantum information sciences. However, its relevance and validity in the contexts of quantum field theory (QFT) remain surprisingly unexplored. In the present paper, we consider Landauer's principle in qubit-cavity QFT interaction perturbatively, in which the initial state of the cavity QFT is chosen to be a vacuum or thermal state. In the vacuum case, the QFT always absorbs heat and jumps to excited states. For the qubit at rest, its entropy decreases, whereas if the qubit accelerates, it may also gain energy and it increases its entropy due to the Unruh effect. For the thermal state, the QFT can both absorb and release heat, depending on its temperature and the initial state of the qubit, and the higher-order perturbations can excite or deexcite the initial state to a higher or lower state. Landauer's principle is valid in all the cases we consider. We hope that this paper will pave the way for future explorations of Landauer's principle in QFT and gravity theories.