SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 48: Optomechanics II
Q 48.2: Talk
Thursday, March 9, 2023, 11:30–11:45, E214
Force-Gradient Sensing and Entanglement via Feedback Cooling of Interacting Nanoparticles — •Henning Rudolph1, Uros Delic2, Markus Aspelmeyer2,3, Klaus Hornberger1, and Benjamin Stickler1 — 1University of Duisburg-Essen, Duisburg, Germany — 2University of Vienna, Vienna, Austria — 3Institute for Quantum Optics and Quantum Information (IQOQI) Vienna, Vienna, Austria
The motion of levitated nanoparticles has recently been cooled into the quantum groundstate by electric feedback [1,2]. In this talk, we show theoretically that feedback-cooling of two levitated, interacting nanoparticles enables differential sensing of forces and the observation of stationary entanglement [3]. The feedback drives the particles into a stationary, non-thermal state which is susceptible to inhomogeneous force fields. We predict that force-gradient sensing at the zepto-Newton per micron range is feasible and that entanglement due to the interaction between charged particles is possible if the detection efficiency of the feedback loop exceeds the ratio of the mechanical normal mode frequencies.
[1] Magrini et al. "Real-time optimal quantum control of mechanical motion at room temperature." Nature (2021)
[2] Tebbenjohanns et al. "Quantum control of a nanoparticle optically levitated in cryogenic free space." Nature (2021)
[3] Rudolph et al. "Force-Gradient Sensing and Entanglement via Feedback Cooling of Interacting Nanoparticles." Physical Review Letters (2022)