Charge state manipulation of qubits in diamond

Bernhard Grotz, Moritz V. Hauf, Markus Dankerl, Boris Naydenov, Sébastien Pezzagna, Jan Meijer, Fedor Jelezko, Jörg Wrachtrup, Martin Stutzmann, Friedemann Reinhard () and Jose A. Garrido ()
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Bernhard Grotz: 3. Physikalisches Institut and SCoPE, Universität Stuttgart
Moritz V. Hauf: Walter Schottky Institut, Technische Universität München
Markus Dankerl: Walter Schottky Institut, Technische Universität München
Boris Naydenov: Institut für Quantenoptik, Universität Ulm
Sébastien Pezzagna: RUBION, Ruhr-Universität Bochum
Jan Meijer: RUBION, Ruhr-Universität Bochum
Fedor Jelezko: Institut für Quantenoptik, Universität Ulm
Jörg Wrachtrup: 3. Physikalisches Institut and SCoPE, Universität Stuttgart
Martin Stutzmann: Walter Schottky Institut, Technische Universität München
Friedemann Reinhard: 3. Physikalisches Institut and SCoPE, Universität Stuttgart
Jose A. Garrido: Walter Schottky Institut, Technische Universität München

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract The nitrogen-vacancy (NV) centre in diamond is a promising candidate for a solid-state qubit. However, its charge state is known to be unstable, discharging from the qubit state NV− into the neutral state NV0 under various circumstances. Here we demonstrate that the charge state can be controlled by an electrolytic gate electrode. This way, single centres can be switched from an unknown non-fluorescent state into the neutral charge state NV0, and the population of an ensemble of centres can be shifted from NV0 to NV−. Numerical simulations confirm the manipulation of the charge state to be induced by the gate-controlled shift of the Fermi level at the diamond surface. This result opens the way to a dynamic control of transitions between charge states and to explore hitherto inaccessible states, such as NV+.

Date: 2012
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DOI: 10.1038/ncomms1729

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