Prospects of phase-adaptive cooling of levitated magnetic particles in a hollow-core photonic-crystal fibre

TL;DR

This paper explores a phase-adaptive cooling method for levitated magnetic particles within hollow-core photonic-crystal fibers, aiming to enable advanced sensing and quantum state preparation.

Contribution

It introduces a novel phase-controlled cooling technique for magnetic particles in fiber-based systems, with detailed analysis of efficiency and noise considerations.

Findings

Feasibility of phase-adaptive cooling demonstrated

Estimates of cooling efficiency and temperature limits provided

Potential applications in sensing and quantum physics discussed

Abstract

We analyze the feasibility of cooling of classical motion of a micro- to nano-sized magnetic particle, levitated inside a hollow-core photonic crystal fiber. The cooling action is implemented by means of controlling the relative phase between counter-propagating fiber guided waves. Direct imaging of the particle's position allows dynamic phase adjustments that produce a Stokes-type cooling force. We provide estimates of cooling efficiency and final achievable temperature, taking into account thermal and detection noise sources. Our results bring forward an important step towards using trapped micro-magnets in sensing, testing the fundamental physics and preparing the quantum states of magnetization.