Le vendredi 25 Septembre à 10H sur le campus P&M Curie, place Jussieu à Paris (RC27, au rez-de-chaussée de l’Atrium) et en vidéoconférence http://desktop.visio.renater.fr/scopia?ID=722002***8343&autojoin

Electromechanical cooling and parametric amplification of an ultrahigh-Q mechanical oscillator

In this thesis, we have studied an ultrahigh quality factor mechanical oscillator coupled to a microwave cavity. We will present an original technique to probe the losses of planar microwave cavities, as well as a resolved sideband cooling technique to actively cool this mechanical oscillator using the microwave cavity. Finally, we will present some optimizations of this experiment which open the path towards the ground state cooling of the mechanical oscillator. Such a hybrid quantum system could be used as an on-chip quantum memory, able to store fragile quantum states generated by superconducting quantum circuits for coherence times approaching a second.