Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: SYQM: Quantum limited measurement applications 1

Q 55.7: Vortrag

Freitag, 16. März 2012, 12:30–12:45, V47.01

Quantum logic readout and cooling of a single dark electron spinFazhan Shi1,3, Boris Naydenov2, Fedor Jelezko2, Jiangfeng Du3, •Friedemann Reinhard1, and Jörg Wrachtrup11Universität Stuttgart und Forschungszentrum SCoPE — 2Universität Ulm — 3University of Science and Technology of China, Hefei/China

The electron spin of the NV center in diamond can be polarized and read out optically. These incidental features have spawned rapidly progressing efforts to use this center for quantum information processing and magnetic sensing. However, the NV center is only one of numerous electron spin defects in diamond, most of which do not feature these attractive properties and are hence refered to as dark spins.

In my talk I present techniques to implement optical initialization and readout on these dark spins by quantum logic control. We have successfully mapped the state of a dark spin to a nearby NV center where it can be read out optically. Using this technique, we have performed pulsed electron spin resonance experiments on a single dark spin. Moreover, we were able to cool a dark spin by swapping its state with a nearby polarized NV.

These two results allow to extend the NV center's two key properties - optical spin polarisation and readout - to any electron spin in its vicinity.

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