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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.11: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Accelerating magnetic field sensing using optimized pulses on NV centers — •Jan Thieme, Ricky-Joe Plate, Josselin Bernardoff, Daniel Basilewitsch, Christiane Koch, and Kilian Singer — Institut für Physik, Uni Kassel, Deutschland

Estimation of physical parameters, such as a magnetic field on a spin, are very often done using the Ramsey method of separated fields for its utmost simplicity and optimality. More sophisticated scheme, using resources such as entanglement to enhance sensitivity achieve records for long measurement times.

We are looking for improvement using pulse sequences that decrease measurement time at the cost of a limited resolution. Indeed, optimal control tools can find pulse shapes, such as a square response - within limitation on hardware -, as a function of detuning which changes the way a resonance search is performed. The protocol's sensitivity can be evaluated using standard tools of estimation theory, in particular the Fisher information.

Such a protocol could for instance allow imaging to be performed on shorter timescales.