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SYDD: Defect centers in diamond for applications in quantum optics and nanophotonics

SYDD 1: Defect centers in diamond for applications in quantum optics and nanophotonics I

SYDD 1.1: Hauptvortrag

Freitag, 6. März 2009, 10:30–11:00, Audi-B

Manipulation and nanopositioning of single NV centers — •Ronald Hanson — Kavli Institute of Nanoscience, Delft University of Technology

Nitrogen-Vacancy (NV) defect centers in diamond are a promising system for spin-based applications in quantum information and communication. Here we present our recent results towards understanding and manipulating single NV spins, as well as controlling the position of individual NV centers with high precision. Although the NV center is studied intensively, there remain significant challenges in understanding its excited-state structure. We use single-spin resonant spectroscopy to observe the excited-state spin levels over a broad range of magnetic fields, yielding a direct measurement of the zero-field splitting, g-factor, transverse anisotropy splitting and hyperfine coupling in the orbital excited state [1]. Second, we study and manipulate the NV spin coherence time. By tuning the NV spin*s environment we find strikingly different behavior [2], leading to important insights into decoherence. Measurements as a function of temperature show that polarization of the spins in the environment fully eliminates their decohering effect [3]. Finally, we will present our first results towards controllably selecting, picking up, moving and positioning single NV centers with ∼10 nm precision.

[1] G. D. Fuchs et al., Phys. Rev. Lett. 101, 117601 (2008)

[2] R. Hanson et al., Science 320, 352 (2008)

[3] S. Takahashi et al., Phys. Rev. Lett. 101, 047601 (2008)