Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quantum Information: Quantum Computation II

Q 25.3: Vortrag

Dienstag, 24. März 2015, 15:00–15:15, C/HSO

Scaling up nitrogen-vacancy center quantum nodes in diamond — •Philipp Neumann, Sebastian Zaiser, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart

The nitrogen vacancy (NV) center in diamond is a spin defect that has proven to be a valuable nanoscopic quantum sensor [1] and it promises applications in quantum communication and computation [2]. It turns out that an associated nuclear spin register is vital for all of these applications. It enables quantum nondemolition spin readout, it stores quantum information and entanglement [3] and it facilitates for instance quantum error correction [4]. However, so far, except for the nitrogen nuclear spin itself, a proper nuclear spin register required searching and thus posed an obstacle for scalability. Here we demonstrate a novel spin control tool that establishes coherent coupling of the central electron spin to on average about 10 proximal nuclear spins. Initialization, non-local gates and individual spin readout in such nuclear spin registers is possible. The method is readily applicable to other central spin systems such as Si:P.

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