Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 95: Spintronics/Quantum information: Vacancies in diamond and SiC (HL, jointly with TT)

HL 95.9: Talk

Friday, March 15, 2013, 11:45–12:00, H14

Tailoring the Diamond: Microwave structures surrounding nano-fabricated solid immersion lenses registered to single emitters in diamond on demand — •Luca Marseglia¹, Florian Striebel¹, Andreas Häußler¹, Boris Naydenov¹, Jan Meijer², and Fedor Jelezko¹ — ¹Institut für Quantenoptik, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm - Germany — ²Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany.

The negatively charged Nitrogen Vacancy color center (NV) is a spin active defect with a long spin lifetime at room temperature. It is a three level system whose value of the ground state spin can be driven by applying a small microwave field making a NV centre a good candidate as qubit for quantum information purpose. To exploit the splitting of the ground state of the NV the control and the precision of a microwave field applied on a single NV is crucial. So we have successfully coupled the NV to a microwave structures, made of metal, lithographically deposited on the diamond, applying high intensity microwave field improving the addressing of the spin and the driving of the Rabi oscillation of the NV. Besides to directly improve the coupling efficiency from a planar surface we formerly developed a technique to fabricate solid immersion lenses (SILs), using Focus Ion Beam (FIB) system, who geometrically avoid any refraction at the diamond-air interface. Eventually we will create a microwave structure, placed precisely on the nanofabricated SIL coupled to the colour centre. These integrated structures will allow us to handle the spin of the NV centre with very high precision and microwave field intensity.