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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.18: Poster

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

Momentum entanglement for atom interferometry — •Christophe Cassens1, Fabian Anders1, Alexander Idel1, Polina Feldman2, Dmitry Bondarenko2, Sina Loriani1, Karsten Lange1, Jan Peise1, Mathias Gersemann1, Bernd Meyer-Hoppe1, Sven Abend1, Naceur Gaaloul1, Christian Schubert1, 3, Dennis Schlippert1, Luis Santos2, Ernst Rasel1, and Carsten Klempt1, 31Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Deutschland — 2Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Deutschland — 3Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR), Institut für Satellitengeodäsie und Inertialsensorik, c/o Leibniz Universität Hannover, DLR-SI, 30167 Hannover

Compared to light interferometers, the flux in cold-atom interferometers is low and the shot noise large. Sensitivities beyond this limitation require the preparation of entangled atoms in different momentum modes.

Here entangled twin-Fock states are deterministically created in the internal spin-degree of freedom of a Bose-Einstein condensate. Hereupon, the entanglement is transferred to distinct momentum-modes using two-photon Raman transitions and verified by measurement of a squeezing parameter.

The observed mode quality and the residual expansion demonstrate that this entangled source is well-suited to the application in light-pulse atom interferometers and opens up a path towards gravimetry beyond the standard quantum limit.

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