Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 25: Quantum Information Systems (Joint session of HL and TT, organized by HL)
HL 25.7: Talk
Tuesday, March 8, 2016, 11:30–11:45, H15
Identification of the positively charge Nitrogen Vacancy center in diamond — Helmut Fedder1, •Sina Burk1, Mathias Pfender1, Nabeel Aslam1, Sebastian Zaiser1, Philipp Neumann1, Andrej Denisenko1, Patrick Simon2, José Garrido2, Martin Stutzmann2, Marcus Doherty3, Neil Manson3, Audrius Alkauskas4, and Jörg Wrachtrup1 — 13. Physikalisches Institut, Uni Stuttgart — 2Walter Schottky Institut, TU München — 3Australian National University, Canberra, Australia — 4Center for Physical Sciences and Technology, Lithuania
Electron and nuclear spins associated with point defects in semiconductors are promising systems for solid state quantum technologies with applications in quantum information processing and quantum sensing. In a typical quantum register architecture, an electron spin is used as an ancilla for readout and control, whereas nuclear spins serve as register qubits [1-2]. Flip-flop processes of the electron spin limit the nuclear spin coherence time. This limitation can be overcome by controlling the defect’s ionization state. Here we increase the coherence time of the 14N nuclear spin associated with the Nitrogen-Vacancy center in diamond by controlling its charge state. We exploit planar double junction diodes fabricated by surface transfer doping with hydrogen [3] to rapidly switch the charge state from NV− (S=1) to NV+ (S=0). We verify the NV+ state by nuclear magnetic resonance and demonstrate the enhancement of the 14N coherence time. [1] Saeedi et al., Science 342, 830 (2013). [2] P.C. Maurer et al., Science 336, 1283 (2012). [3] M. Hauf et al., Nano Lett. 14, 2359 (2014)