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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.26: Poster

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

Quantum-clock interferometry — •Mario Montero1, Ali Lezeik1, Klaus Zipfel1, Ernst M. Rasel1, Christian Schubert1,2, and Dennis Schlippert11Leibniz Universität Hannover- Insititut für Quantenoptik — 2Deutsches Zentrum für Luft und Raumfahrt, Institut für Satellitengeodäsie und Inertialsensorik

Universality of Gravitational Redshift (UGR) states that the time dilation measured by two objects in a gravitational field is independent of their composition. Testing the validity of UGR can be achieved through Quantum-Clock Interferometry (QCI), where a sequence of light pulses is used to split, redirected and recombined wave packets and drive transitions between internal states of the atom to measure a phase shift between the interferometer arms. However only certain space-time geometries are sensitive to gravitational time dilation effects [1].

We discuss proposals for QCI geometries that are sensitive to the gravitational redshift, and our approach for an experimental implementation in the Very Long Baseline Atom Interferometry (VLBAI) facility in Hannover [2]. Due to its long lived clock state, ytterbium (Yb) is an appealing candidate to measure differences in proper time. We present the current status of our high-flux source of laser-cooled Yb-174 atoms [3].

[1] C. Ufrecht et al, Phys. Rev. Research 2, 043240 (2020).

[2] D. Schlippert et al, arXiv:1909.08524 (2019).

[3] E. Wodey et al, J. Phys. B: At. Mol. Opt. Phys. 54 035301 (2021).

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