Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 50: Matter Wave Interferometry and Metrology II

Q 50.2: Talk

Thursday, March 5, 2026, 11:15–11:30, P 11

Optimal Ramsey protocols employing QND-squeezed states — •Maja Scharnagl¹ and Klemens Hammerer^{1, 2} — ¹Institute for theoretical physics, Leibniz Universität Hannover, Germany — ²Institute for theoretical physics, Universität Innsbruck, Austria

We investigate quantum non-demolition (QND) measurements and their application in Ramsey protocols. In doing so, we optimize the axes of signal imprint and measurement and perform clock simulations for comparing the optimized protocols to QND-protocols with feedback, aligning the squeezed state with the equator of the Bloch sphere. We include individual and collective dephasing in our description and minimize the analytically calculated Allan deviation of these protocols over the QND-squeezing-strength.

Keywords: Ramsey protocols; Clock simulations; QND-measurements