Talk given by Dr. Witlef Wieczorek Faculty of Physics University of Vienna Abstract: Mechanical devices are utilized for numerous applications, such as for acceleration sensors in mobile phones or force sensors in atomic force microscopes. Bringing quantum control to mechanical devices, will unlock completely novel opportunities in force sensing, quantum information processing and fundamental physics studies. Cavity optomechanical systems have become a key starter for controlling mechanical devices in the quantum regime. They allow to implement well known quantum optics interactions that can be used for controlling the mechanical oscillator, e.g., for cooling its motion or for generating optomechanical entanglement. A completely novel approach towards quantum control of mechanical systems is based on magnetic levitation of micron-scale superconducting spheres. This may yield mechanical systems with ultrahigh quality factors that can be interfaced to superconducting circuits. In my talk I will give an introduction to the field of cavity optomechanics and levitated quantum magnetomechanics. Further, I will present our recent work on how to optimally estimate the state of a cavity optomechanical system. This state estimation protocol is based on Kalman filtering, which is a method known from 'classical' signal processing. I illustrate its application for a micromechanical cantilever that is coupled to a high-Finesse optical cavity, both in the weak and strong coupling regime.

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Dr. Witlef Wieczorek

Faculty of Physics, University of Vienna
http://aspelmeyer.quantum.at/witlef-wieczorek.3144.html

Organizer
Prof. Dr. Martin Wegener
Angewandte Physik und Institut für Nanotechnologie
Karlsruher Institut für Technologie (KIT)
Karlsruhe
Mail: martin wegener ∂does-not-exist.kit edu
https://www.aph.kit.edu/wegener/

Targetgroup
Interested / Everyone