Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Solid State Photon Sources

Q 16.3: Talk

Tuesday, March 15, 2011, 11:15–11:30, HSZ 02

Fiber-integrated diamond-based single photon source — •Tim Schröder, Andreas Wolfgang Schell, Günter Kewes, Thomas Aichele, and Oliver Benson — Nano Optics Group, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

The most direct approach to fabricate a reliable single photon source is to mount a single quantum emitter on an optical fibre. It integrates easily into fibre optic networks for quantum cryptography or quantum metrology applications . For the first time such a fibre-integrated single photon source operating at room temperature is demonstrated. It consists of a single nitrogen vacancy defect centre in a nanodiamond which is directly near-field coupled to the guiding modes of a commercial optical fibre. The coupling is achieved in a bottom-up approach by placing a pre-selected nanodiamond directly on the fibre facet. This configuration is ultra-stable and realignment-free. Its high photon collection efficiency is equivalent to a far-field collection via an objective with a numerical aperture of 0.82. Furthermore, simultaneous excitation of the single defect centre and recollection of its fluorescence light through the fibre is possible introducing a fibre-connected single emitter sensor.