Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 76: Quantum Information Systems I (organized by HL)
TT 76.5: Talk
Wednesday, April 2, 2014, 16:00–16:15, POT 006
Few spin NMR of external spins using a strongly coupled sensor in diamond — •Christoph Müller1, Xi Kong2, Jiangming Cai3, Kristina Melentijević1, Alastair Stacey4, Matthew Markham4, Daniel Twitchen4, Junichi Isoya5, Sébastien Pezzagna6, Jan Meijer6, Jiangfeng Du2, Martin Plenio3, Boris Naydenov1, Liam McGuinness1, and Fedor Jelezko1 — 1Institute for Quantum Optics, University Ulm, Germany — 2Hefei National Laboratory for Physics Sciences at Microscale and Depatment of Modern Physics, University of Science and Technology of China, Hefei, China — 3Institute for Theoretical Physics, University Ulm, Germany — 4Element Six, Ltd, Ascot, Berkshire, United Kingdom — 5Research Center for Knowledge Communities, University of Tsukuba, Ibakiri, Japan — 6Experimental Physics II, University Leipzig, Germany
Negatively charged nitrogen-vacancy (NV−) centres in diamond, located around 2 nm below the diamond surface were used as a NMR sensor at room-temperature. Strong coupling between the electron spin of the NV− centre and external nuclear 29Si spins on the diamond surface made it possible to measure the NMR signal aroused by four nuclear spins. With the achieved signal to noise ratio, single spin sensitivity within seconds is possible. In addition, the field gradient created by the NV− centre itself combined with compressed sensing enables to locate the detected individual nuclei with Angstrom resolution.