Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Optomechanics I
Q 49.7: Vortrag
Donnerstag, 3. März 2016, 12:30–12:45, f342
Phononic bandgap membranes for high quantum cooperativity optomechanics — Yeghishe Tsaturyan, Andreas Barg, William Nielsen, Christoffer Moller, Eugene Polzik, and •Albert Schliesser — Niels Bohr Institute, Copenhagen, Denmark
We combine an engineered phononic density of states with stress-induced mechanical dissipation dilution to obtain nanomechanical membrane resonators with Qf-products exceeding kB T/ h already at room temperature. At moderate (4He) cryogenic temperatures, these devices feature quantum cooperativities well above unity when combined with a compact Fabry-Perot resonator, enabling the observation of quantum backaction, optomechanical light squeezing and preparation of the quantum ground state with high probability (n 1). In addition, the intrinsic multi-mode nature of the Fabry-Perot cavity, and the relatively open access to the membrane lend itself to multimode entanglement and quantum coherent conversion schemes both in the optical-optical and electro-optical domains.