SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.47: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

En Route to hour long spin manipulation established via constantly driven Rabi nutation measurements — •Tianhao Liu, Jens Voigt, Silvia Knappe-Grüneberg, and Wolfgang Kilian — Physikalisch-Technische Bundesanstalt, 10587 Berlin, Germany

We describe a method for estimating the Larmor frequency of polarized nuclear spins by utilising Rabi nutation that is driven by an applied near-resonant magnetic field. Two data analysis methods for retrieving the Larmor frequency from the precession signals recorded by magnetometers on top of the cell are proposed and further verified with numerical simulations. Compared to the commonly used free decay method, the proposed method has distinct advantages on smaller polarisation loss and shorter measurement time. Main systematic sources on the estimated Lamour frequency by this method are identified and quantitively analysed with a forward analytic model. A series of experiments, where a cell of 3He polarised via spin-exchange optical pumping is placed under a SQUID system in a magnetically shielded room, have been performed to validate this method. A preliminary analysis shows that the relative uncertainty of less than 10-6 on the Lamour frequency could be achieved with data taken within few hundred seconds. This method could be used for traceable weak magnetic field measurements. Moreover, it provides a basis for coherently manipulating the nuclear spins for over an hour-long interval. To the end, we will present a slow Rabi nutation of 3He driven by near-resonance magnetic field over 1 hour.