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This research paper derives the decoherence rate for magnetic nanoparticles in quantum superposition within a thermal electromagnetic field using the fluctuation-dissipation theorem. It further extends these calculations to adjacent diamagnetic particles and analyzes drag forces arising from external field fluctuations, offering theoretical insights into maintaining coherence at the nanoscale.

Source coveringarXiv

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Momentum Diffusion, Decoherence and Drag Force on a Magnetic Nanoparticle

arXivJuly 23, 20261 min read

arXiv:2602.21518v3 Announce Type: replace 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.

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.

arXiv:2602.21518 [quant-ph]

(or arXiv:2602.21518v3 [quant-ph] for this version)

Full text under the publisher's open licence · 113 words

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