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Landauer's principle has seen a boom of interest in the last few years due tothe growing interest in quantum information sciences. However, its relevanceand validity in the contexts of quantum field theory (QFT) remain surprisinglyunexplored. In the present paper, we consider Landauer's principle inqubit-cavity QFT interaction perturbatively, in which the initial state of thecavity QFT is chosen to be a vacuum or thermal state. In the vacuum case, theQFT always absorbs heat and jumps to excited states. For the qubit at rest, itsentropy decreases, whereas if the qubit accelerates, it may also gain energyand 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 theinitial state of the qubit, and the higher-order perturbations can excite ordeexcite the initial state to a higher or lower state. Landauer's principle isvalid in all the cases we consider. We hope that this paper will pave the wayfor future explorations of Landauer's principle in QFT and gravity theories.

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