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Q: Fachverband Quantenoptik und Photonik

Q 47: Precision measurements and metrology II

Q 47.2: Gruppenbericht

Donnerstag, 20. März 2014, 17:00–17:30, DO24 1.101

Optimally designed magnetic field sensing with nitrogen-vacancy centers — Tobias Nöbauer¹, •Björn Bartels², Andreas Angerer¹, Florian Mintert^2,3, and Johannes Majer¹ — ¹Atominstitut, TU Wien & Vienna Center for Quantum Science and Technology, Stadionallee 2, 1020 Wien, Austria — ²Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstr. 19, 79104 Freiburg, Germany — ³Department of Physics, South Kensington Campus, Imperial College, London, SW7 2AZ, UK

Sensing of small magnetic fields on the nano-scale can be achieved with the help of nitrogen-vacancy (NV) centers. We experimentally demonstrate an enhancement of sensitivity in a spin-echo-based sensing scheme by using shaped microwave pulses. The pulses are the result of optimization in frequency space, which permits us to find narrow-band pulses that achieve robustness against imperfections, such as ensemble broadening. We verify this robustness experimentally with quantum gates on individual NV centers and use these gates for sensing with macroscopic ensembles of NV centers. The potential of the present framework for applications beyond sensing is demonstrated theoretically with the control of entanglement dynamics and the realization of time-optimal gates.