Bonn 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optomechanics I
Q 12.4: Vortrag
Montag, 10. März 2025, 17:45–18:00, HS I
Prospects of phase-adaptive cooling of levitated magnetic particles in a hollow-core photonic-crystal fibre — •Pardeep Kumar1, Fidel G. Jimenez2, Soumya Chakraborty3,1, Gordon K. L. Wong1, Nicolas Y. Joly3,1, and Claudiu Genes1,3 — 1Max Planck Institute for the Science of Light, Staudtstraße 2, D-91058 Erlangen, Germany — 2Pontificia Universidad Católica del Perú, Av. Universitaria 1801, San Miguel 15088, Peru — 3Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, D-91058 Erlangen, Germany
We present a viable scheme to mitigate the thermal fluctuations associated with the classical motion of a micro- to nano-sized magnetic particle, optically levitated inside a hollow-core photonic crystal fiber. The proposed technique is based on a phase-adaptive feedback mechanism and requires only the detection of mechanical quadratures to accomplish cooling. Such an operation can be implemented by directly imaging the particle's position and subsequent processing of the acquired information to adjust the trapping laser's phase, which leads to a Stokes type of viscous force. We provide analytical expressions for the achievable final occupancy and cooling rates, considering both the thermal and measurement noises and benchmark our analytical expressions against full numerical stochastic simulations. Our results are consequential for using trapped micro-magnets in sensing, testing the fundamental physics and preparing the quantum states of magnetization.
Keywords: Cooling; Feedback; Photonic Crystal Fiber; Occupation; Measurement