Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.49: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Coherent spin dynamics in isotopically pure diamond — •Helmut Fedder1, Jan Honert1, Michael Klas1, Florian Dolde1, Junichi Isoya3, Matthew Markham2, Daniel Twitchen2, Fedor Jelezko1, and Jörg Wrachtrup1 — 1Universität Stuttgart, 70550 Stuttgart, Germany — 2Element Six Ltd, Ascot, UK — 3Graduate School of Library, Information and Media Studies, University of Tsukuba, 1-2 Kasuga, Tsukuba, Japan
Nitrogen-Vacancy (NV) centers in diamond are promising solid-state spin system for applications in quantum information and communication, that allow optical readout and coherent spin manipulation even at room temperature. Of pivotal importance for scalable NV based quantum architectures is a long spin coherence time in the diamond host material. In diamond, spin coherence is typically limited by coupling of the NV centers to adjacent 13C nuclear spins, that occurr with a natural abundance of 1.1%. Here we present our recent results towards ultralong coherent spin dynamics in isotopically pure diamond, and their application to magnetic-dipole type spin-spin entanglement. We find that spin coherence times get close to the limit set by spin-lattice relaxation. Complementary, we study the decoupling of the electron spin from magnetic fluctuations through |+> and |-> type excitations in 'dirty' diamond host material under zero magnetic field conditions. We give an account of the resulting perspectives for quantum gate operations using bias field switching.