Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 36: Matter Wave Interferometry and Metrology I

Q 36.2: Vortrag

Mittwoch, 4. März 2026, 14:45–15:00, P 11

Differential phase estimation and bias correction techniques in cold atom interferometer experiments — •David B. Reinhardt and Matthias Meister — German Aerospace Center (DLR e.V.), Institute of Quantum Technologies, Ulm, Germany

Ellipses are omnipresent in mathematics, computer vision and science. For instance, when analyzing differential interferometric data or performing clock comparisons one often needs to fit an ellipse to a given noisy data set. There are mainly two different approaches to achieve this, the algebraic and the geometric method. However, all fitting methods regardless of the approach typically have different accuracy (bias) vs. precision(variance) trade-offs, and therefore can produce quite different outcomes. In this talk, we present new insights regarding the origin of bias in the differential phase estimation. Further, we show how this knowledge can be used to correct bias in cold atom interferometry experiments and also provide rigorous bounds for the achievable estimation precision. The new findings and methods presented in this talk thus have significant consequences for the understanding and handling of measurement errors of quantum sensors based on differential interferometers.

Keywords: Differential Atom Interferometry; Differential Phase Estimation; Bias Mitigation; Quantum Sensors; Accuracy vs. Precision Trade-off