Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 3: Poster Quanteninformation, -kommunikation und Quantencomputer
Q 3.33: Poster
Freitag, 4. März 2005, 11:00–12:30, Poster HU
Scaling up Diamond Based Quantum Computing: Controlled Coupling of Single Defects — •Michael Domhan1, Christoffer Wittmann1, Torsten Gaebel1, Iulian Popa1, Jan Meijer2, Bernd Burchard2, James Rabeau3, Steven Prawer3, Fedor Jelezko1, and Jörg Wrachtrup1 — 13. Physikalisches Institut, Universität Stuttgart, Germany — 2Experimentalphysik III, Ruhr-Universität Bochum, Germany — 3University of Melbourne, Australia
Readout and manipulation of the single spin states are crucial basics for spin-based quantum information processing. As formerly shown optically detected magnetic resonance techniques can be used to investigate single paramagnetic nitrogen-vacancy (NV) defect centers in diamonds. As two-qubit operations on single NV-defect centers with neighbouring 13C have already been performed, the effort will now be concentrated on controlled magnetic dipolar coupling between different NV-centers.
Dipole-dipole interaction can only be observed below distances of 10nm between two NV-centers. For obtaining this the generation of NV-defects at well defined positions close to each other is necessary. To produce interacting nitrogen-ion pairs molecular nitrogen has been impanted locally in type-IIa diamond. During annealing vacancies produced by implantation bind to implanted nitrogen pairs forming two NV centers. Our latest measurement results concerning decoherence time and observation of coupling are presented. Understanding the state evolution will allow addressing and scaling up NV based quantum computation.