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Q: Fachverband Quantenoptik und Photonik

Q 55: Quanteneffekte (Lichtstreuung I)

Q 55.2: Vortrag

Donnerstag, 22. März 2007, 12:15–12:30, 5E

Single-Photon emission from Silicon-Vacancy centers in diamond — •Juliane Bahe¹, Chunlang Wang¹, Harald Weinfurter¹, Vladimir Chernychev^{1, 2}, and Jan Meijer² — ¹Sektion Physik, Ludwig-Maximilians-Universität München, D-80779 München, Germany — ²Experimantalphysik III, Ruhr-Universität-Bochum, D-44780 Bochum, Germany

We report on single photon emission from SiV (silicon-vacancy) centers in bulk diamond and diamond nanocrystals. The investigated SiV centers are highly photostable and emit single photons with a narrow zero phonon line (FWHM 5nm) centered at 738nm and very weak vibronic sidebands at room temperature. The short luminescence lifetime (1.2ns) should enable efficient single photon generation. Therefore the SiV center in diamond may be a promising candidate for the practical applications in quantum cryptography.
Possibly due to the existence of a non-fluorescent neutral charge state, the actually observed quantum efficiency is very low[1]. Here we investigate the effects of additional nitrogen doping which should allow to stabilize the negatively charged, radiating SiV center in order to significantly increase single photon emission.

[1] C. Wang, C. Kurtsiefer, H. Weinfurter and B. Burchard, J. Phys. B: At. Mol. Opt Phys. 39 (2006) 37-41