SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 67: Optomechanics III
Q 67.1: Talk
Friday, March 10, 2023, 11:00–11:15, F442
Hollow core photonic crystal fibers as sources for levitated nanoparticles in future quantum experiments — •Stefan Lindner, Yaakov Fein, Paul Juschitz, Jakob Rieser, Markus Aspelmeyer, and Nikolai Kiesel — University of Vienna, Faculty of Physics
Over the last decade several proposals using optically levitated nanoparticles as a platform to create macroscopic quantum states have been put forth. Yet as of today environmental decoherence still poses a substantial roadblock hindering the access to such experiments. Especially the interaction with background gas molecules has to be overcome by reducing the pressure these experiments are conducted in. The attainable vacuum for levitation experiments is directly related to the type of particle loading scheme in place. Here we present a novel method for loading nanoparticles via hollow core photonic crystal fibers, that allows direct loading of into pressures in the ultra high vacuum (UHV) regime.
By guiding two counter-propagating lasers of equal wavelength through a hollow core fiber one creates an “optical conveyor belt” that connects an UHV pressure main vacuum chamber to an ambient or low vacuum “loading” chamber. By detuning one of the two lasers with respect to the other, nanoparticles can be transported from the loading chamber, through the fiber, directly into the trap in the main vacuum chamber. This handover of particles has been demonstrated down to pressures of 10−8 mbar and is currently extended, targeting below 10−10 mbar, where gas collisions occur at sub-kHz timescales.