Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.46: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Ultralong coherence times of single electron — •Alexander Gerstmayr, Kay Jahnke, and Rainer Pfeiffer — Institut für Quantenoptik, Universität Ulm

During the last decade, on the search for a solid state quantum bit system, scientists have put a lot of effort into the Nitrogen Vacancy centers (NVs) of diamond. In the need of long coherence times, for performing quantum operations, they try to avoid many obstacles, that cause decoherence, like fluctuating spins of uncoupled nitrogen atoms or C13 impurities in the crystall lattice. The latter ones lead with a natural abundance of 1.1 percent to strong spin coupling between NVs and the C13 spins. A solution of this problem is the usage of highly C12 enriched diamond samples with a C12 concentration of 99.999%. Our work shows, that there is no big difference in coherence times regarding mono- or polycrystalline diamond samples. What really counts, are low nitrogen and C13 concentrations.