Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.33: Poster

Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer

Robust Dynamical Decoupling Driven by Pulses with Field Inhomogeneities in Pr:YSO — •Niklas Stewen, Markus Stabel, and Thomas Halfmann — Technische Univeristät Darmstadt, Germany

We present a demonstration experiment in which we compare the robustness of state-of-the-art composite pulse (CP) sequences for dynamical decoupling with regard to typically unavoidable inhomogeneities in the driving radiofrequency (RF) pulses. To systematically vary and characterize the field inhomogeneity, we modify the winding number of our driving RF coils, and, using an orthogonal addressing of the crystal, perform a spatially resolved measurement of the Rabi frequency distribution in 3D. We quantify the performance of CP sequences at different inhomogeneities by measuring the coherence time of EIT light storage in a Pr:YSO crystal. We find that already for rather homogeneous driving fields, CP sequences and in particular the universal robust (UR) family of sequences provide a large improvement compared to the standard CPMG sequence. This advantage further increases with the field inhomogeneity.

Keywords: Dynamical Decoupling; Composite Pulses; EIT Light Storage; Quantum Memory; Rare Earth