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HL: Fachverband Halbleiterphysik
HL 4: Carbon: Diamond, Nanotubes, and Graphene
HL 4.1: Talk
Monday, March 14, 2011, 10:15–10:30, POT 251
Dynamical Decoupling of a single electron spin at room temperature — •Florian Dolde1, Boris Naydenov1, Liam T. Hall2, Chang Shin3, Helmut Fedder1, Lloyd C.L. Hollenberg2, Fedor Jelezko1, and Jörg Wrachtrup1 — 13. Physikalisches Institut and Research Center SCOPE, University of Stuttgart, Stuttgart 70659, Germany — 2Centre for Quantum Computer Technology, School of Physics, University of Melbourne, Victoria 3010, Australia — 3)National Biomedical Center for Advanced ESR Technology, Dept of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
The negatively charged Nitrogen-Vacancy center (NV) in diamond attracted a lot of interest lately due to the possibility of optical spin state read out of a single center and the possibility of coherent manipulations with microwaves at room temperature. Due to these unique properties the NV is an excellent candidate for room temperature quantum information processing and very sensitive magnetometry using an atom sized sensor. Here we report the increase of the coherence time T2 of a NV by using dynamical decoupling. We show that the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence can prolong the T2 of a single Nitrogen-Vacancy center in diamond up to 2.44 ms compared to the Hahn echo measurement where T2 = 390 µs. Moreover, by performing spin locking experiments we demonstrate that with CPMG the maximum possible T2 is reached. An application for detecting low magnetic field is demonstrated, improving the sensitivity by about a factor of two compared to the Hahn echo method.