Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.10: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Gravitational redshift in atomic clocks and atom interferometers — •Fabio Di Pumpo1, Christian Ufrecht1, Alexander Friedrich1, Albert Roura2, Wolfgang P. Schleich1,2, and Enno Giese1 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm — 2Institute of Quantum Technologies, German Aerospace Center (DLR), Söflinger Straße 100, D-89077 Ulm
The question of which atom-interferometer geometries can be used to test the gravitational redshift is at the center of a long-standing debate. We compare in this contribution classical redshift tests through the synchronization of two atomic clocks with the measurement results found in atom interferometers relying on i) quantum clock interference [1] or ii) internal state transitions during the interferometer [2]. For this purpose, we introduce a dilaton model which consistently parametrizes violations of the Einstein equivalence principle. Based on this model, we derive the corresponding phase shifts for atomic clocks and atom interferometers and study their differences. Consequently, we identify a large class of atom-interferometer geometries which measure violations of the universality of the gravitational redshift.
[1] Nat. Commun. 2, 505 (2011) [2] arXiv:1810.06744 (2018)
The QUANTUS project is supported by the German Aerospace Center (DLR) with funds provided by the Federal Ministry of Economics and Technology (BMWi) due to an enactment of the German Bundestag under grant number DLR 50WM1956 (QUANTUS V).