Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Quantum Information: Photons and Nonclassical Light 1

Q 53.4: Vortrag

Donnerstag, 17. März 2011, 15:15–15:30, SCH 251

Near-unity collection efficiency of single photons using a planar dielectric antenna — •Kwanggeol Lee, Xuewen Chen, Hadi Eghlidi, Philipp Kukura, Alois Renn, Vahid Sandoghdar, and Stephan Götzinger — Laboratory of Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland

Single-photon sources have been discussed as the building blocks of quantum cryptography, optical quantum computation, spectroscopy, and metrology. However, the feasibility of these proposals depends on the availability of single photons with a high fidelity. For sources based on single emitters, this implies near-unity collection efficiency into well-defined modes. Some of the current state-of-the-art efforts aimed at achieving these criteria have been demonstrated, but despite an impressive progress the results still fall short. In particular, a collection efficiency of 38% were reported using microresonators[1], while a nanowire device reached an efficiency of 72% at cryogenic temperatures[2]. Here we report on a broad-band room-temperature scheme, which uses a layered dielectric structure for tailoring the angular emission of a single oriented molecule such that more than 96% of the emitted photons are collected with a microscope objective, leading to recorded photon count rates of about 50 MHz[3]. Our approach is wavelength insensitive and compatible with cryogenic experiments and can therefore be extended to other solid state emitters, including defect centers in diamond and semiconductor quantum dots. [1] S. Strauf et al. Naure Photon. 1, 704-708 (2007). [2] J. Claudon et al. Nature Photon. 4, 174-177 (2010). [3] K-G. Lee et al. Nature Photon., to appear.