Momentum Diffusion, Decoherence and Drag Force on a Magnetic Nanoparticle

TL;DR

This paper derives the decoherence rate for magnetic nanoparticles in quantum superposition due to electromagnetic fluctuations, extends the analysis to two nanoparticles, and examines the drag force arising from field interactions.

Contribution

It provides a complete derivation of decoherence rates using fluctuation-dissipation theorem and explores electromagnetic effects on magnetic nanoparticles in quantum states.

Findings

Decoherence rate depends on electromagnetic field fluctuations.

Drag force on nanoparticles arises from external electromagnetic interactions.

Extension of decoherence analysis to two interacting nanoparticles.

Abstract

In this paper, we will provide a complete derivation of the decoherence rate for a magnetic nanoparticle in quantum superposition in the presence of the fluctuating electromagnetic field in a thermal background by using the fluctuation-dissipation theorem in the long-wavelength limit. The long-wavelength limit assumes that the superposition size is much smaller than the wavelength of the electromagentic filed fluctuations. We will extend this computation to two diamagnetic nanoparticles kept in quantum superposition adjacent to each other. We will also show how the drag force on a single nanoparticle arises from external electromagnetic-field fluctuations, and compare our results with those for the nanoparticle's dielectric properties.