Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 67: Quantum information systems I (with MA/TT)

HL 67.5: 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.