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Q: Fachverband Quantenoptik und Photonik
Q 36: Matter Wave Interferometry and Metrology I
Q 36.1: Talk
Wednesday, March 4, 2026, 14:30–14:45, P 11
Optimal Squeezing in Lossy Bragg Interferometers — •Julian Günther1,2, Rui Li2, Jan-Niclas Kirsten-Siemss2, Naceur Gaaloul2, and Klemens Hammerer3 — 1Institut für Theoretische Physik, Leibniz Universität Hannover, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 3Institute for Theoretical Physics, University of Innsbruck, Austria
Using entanglement for N-particle states in matter wave interferometers allows one to outperform the standard quantum limit of 1/√N for the uncertainty in the phase measurement. We consider the use of one-axis twisted, spin squeezed atomic states in light-pulse Bragg interferometers. We evaluate the interferometric phase uncertainty taking into account the fundamental multi-port and multi-path nature of higher-order Bragg processes, and determine optimally squeezed states for a given geometry and pulse shapes. For Gaussian temporal pulses we demonstrate the necessary tradeoff between the squeezing strength and momentum distribution of the incoming atomic state to benefit from the entanglement.
This project was funded within the QuantERA II Programme that has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No 101017733 with funding organisation DFG (project number 499225223).
Keywords: Squeezing; Bragg Interferometer; Matter Wave Interferometer