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TT: Fachverband Tiefe Temperaturen

TT 58: Superconductivity: Qubits 2

TT 58.12: Vortrag

Donnerstag, 4. April 2019, 18:00–18:15, Theater

Towards single-shot readout of NV centers in diamond by low-temperature spin-to-charge conversion — •Dominik M. Irber¹, Michael Kieschnick², Jan Meijer², and Friedemann Reinhard¹ — ¹TU München, Walter Schottky Institut und Physik-Department, Am Coulombwall 4, 85748 München — ²Felix-Bloch-Institut für Festkörperphysik Abteilung Nukleare Festkörperphysik, Linnéstraße 5, 04103 Leipzig

We present our recent progress in implementing an improved readout scheme for the nitrogen-vacancy (NV) center's spin-state combining resonant excitation at low temperature with spin-to-charge conversion. Resonant excitation exploits that the optical excitation spectrum at low temperature has sufficiently narrow linewidths to selectively address the spin-sublevels. In combination with a second laser pulse, a spin-to-charge conversion protocol can be implemented, where the NV center is spin-selectively excited and converted to different charge-states. These are more stable than the initial spin-state and can currently be read-out with near single-shot fidelity.

Compared to the state-of-the-art readout, this work promises to accelerate readout by a factor of up to 100. Besides, laser power in the optical regime can be reduced by orders of magnitude. This reduces the risk of photodamage for future sensing experiments with biological samples.