Speaker
Maryse Ernzer
(Universität Basel)
Description
We employ coherent feedback as strategy to improve quantum control of an optomechanical system, by implementing a feedback platform that avoids measurements and their associated decoherence. This is implemented via an optical light beam that sequentially interacts twice with a nanomechanical membrane placed inside an optical cavity. Theoretically this scheme allows for ground-state cooling even in the unresolved cavity sideband regime. Experimentally, tuning the optical phase and delay of the feedback improves our motional state control and allows to cool the membrane to a state with nm = 4.89 ± 0.14 phonons which lies below the theoretical limit of cavity dynamical backaction cooling in the unresolved sideband regime.
Author
Maryse Ernzer
(Universität Basel)
Co-authors
Manel Bosch Aguilera
(Universität Basel)
Matteo Brunelli
(Universität Basel)
Gian-Luca Schmid
(Universität Basel)
Thomas Karg
(Universität Basel)
Christoph Bruder
(Department of Physics, University of Basel)
Patrick Potts
(Universität Basel)
Philipp Treutlein
