Detectable Signature of Quantum Friction on a Sliding Particle in Vacuum

TL;DR

This paper proposes using the geometric phase of a particle as a sensitive indicator to detect quantum friction effects during sliding motion in vacuum, aiming to facilitate experimental observation of this elusive phenomenon.

Contribution

It introduces a novel method to detect quantum friction by measuring geometric phase shifts, providing a feasible experimental scheme for observing non-contact quantum friction.

Findings

Decomposition of decoherence contributions from vacuum and motion.

Proposal of a velocity-dependent correction to geometric phase as a quantum friction signature.

Experimental scheme to measure quantum friction effects via coherence and phase changes.

Abstract

Spatially separated bodies in relative motion through vacuum experience a tiny friction force known as quantum friction. This force has so far eluded experimental detection due to its small magnitude and short range. Quantitative details revealing traces of the quantum friction in the degradation of the quantum coherence of a particle are presented. Environmentally induced decoherence for a particle sliding over a dielectric sheet can be decomposed into contributions of different signatures: one solely induced by the electromagnetic vacuum in presence of the dielectric and another induced by motion. As the geometric phase has been proved to be a fruitful venue of investigation to infer features of the quantum systems, herein we propose to use the accumulated geometric phase acquired by a particle as a quantum friction sensor. Furthermore, an innovative experiment designed to track traces of quantum friction by measuring the velocity dependence of corrections to the geometric phase and coherence is proposed. The experimentally viable scheme presented can spark renewed optimism for the detection of non-contact friction, with the hope that this non-equilibrium phenomenon can be readily measured soon.