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MA: Fachverband Magnetismus
MA 19: Characterization and Instrumentation
MA 19.2: Vortrag
Montag, 16. März 2020, 17:30–17:45, HSZ 101
Optimally Controlled Pulses on NV Centers — •Thomas Reisser1,3, Marco Rossignolo2,4, Ressa S. Said2, Tommaso Calarco1,3, Simone Montangero4, and Fedor Jelezko2 — 1Institute for Quantum Control, PGI-8, Forschungszentrum Jülich GmbH, Jülich — 2Institute for Quantum Optics, Ulm University, Ulm — 3Institute for Theoretical Physics, University of Cologne, Cologne — 4Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova
Nitrogen vacancy centers in diamond display remarkable features such as optical polarizability and the read-out of their state at room temperature. Sensitivity to temperature and electric and magnetic fields enables their application for quantum sensing. Unexpected noise sources and long-term drifts of the driving magnetic field strength affect its interaction with the qubit. Long pulse schemes for quantum state preparation are not always suitable due to limited lifetimes. Hence, we designed optimally controlled pulses to drive the nitrogen vacancy center to a target state with robustness against frequency detuning within the transfer time of a standard square pulse. This can be achieved by a time-dependent variation of the applied pulse amplitude. Simulations showed further improvement in robustness for simultaneous carrier frequency modulation. As a next step, closed-loop optimization could be performed, where the simulated model is replaced by direct measurements on the NV center in the laboratory. Therefore, the remote dressed chopped random basis algorithm software (RedCRAB) is included in Qudi, a software suite for experiment control.