Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 30: Quantum Effects: QED II / Interference and Correlations III

Q 30.2: Talk

Wednesday, March 10, 2010, 14:15–14:30, A 320

On-demand positioning of a preselected quantum emitter on a fiber-coupled toroidal microresonator — Markus Gregor, •Rico Henze, Tim Schröder, and Oliver Benson — AG Nanooptik, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin

Toroidal microresonators are a valuable system to study cavity quantum electrodynamic (cQED) effects due to their high Q factors and small mode volume. It is particularly interesting to couple single quantum emitters to these cavities in order to investigate their potential for applications in quantum information processing. We present here a novel technique which uses tapered optical fibers to manipulate and transfer a preselected diamond nanocrystal onto such microcavities. Optical coupling of few nitrogen vacancy (NV) color centers contained inside the nanocrystal to the resonator modes is demonstrated by detecting the fluorescence via a tapered optical fiber coupler. A clear antibunching in the photon correlation measurement is observed indicating emission from only six NV centers residing inside the nanocrystal. The latter is confirmed by a photoluminescence spectrum at liquid helium temperature resolving individual zero phonon lines.