Thermal corrections to quantum friction and decoherence: A closed-time-path approach to atom-surface interaction

Ludmila Viotti, M. Belén Farías, Paula I. Villar, and Fernando C. Lombardo
Phys. Rev. D 99, 105005 – Published 13 May 2019

Abstract

In this paper we study the dissipative effects and decoherence induced on a particle moving at constant speed in front of a dielectric plate in quantum vacuum, developing a closed-time-path (CTP) integral formulation in order to account for the corrections to these phenomena generated by finite temperatures. We compute the frictional force of the moving particle and find that it contains two different contributions: a pure quantum term due to quantum fluctuations (even present at vanishing temperatures) and a temperature-dependent component generated by thermal fluctuations (the bigger the contribution, the higher the temperature). We further estimate the decoherence timescale for the internal degree of freedom of the quantum particle. As expected, decoherence time is reduced by temperature; however, this feature is stronger for large velocities and for resonant situations. When the particle approaches relativistic speed, decoherence time becomes independent of temperature. The finite temperature corrections to the force or even in the decoherence timescale could be used to track traces of quantum friction through the study of the velocity dependence since the sole evidence of this dependence provides an indirect testimony of the existence of a quantum frictional force.

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  • Received 25 January 2019

DOI:https://doi.org/10.1103/PhysRevD.99.105005

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Ludmila Viotti*, M. Belén Farías, Paula I. Villar, and Fernando C. Lombardo

  • Departamento de Física Juan José Giambiagi, FCEyN UBA and IFIBA CONICET-UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina

  • *Corresponding author. lombardo@df.uba.ar, fer.lombardo@gmail.com

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Vol. 99, Iss. 10 — 15 May 2019

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