Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster VII
Q 56.12: Poster
Donnerstag, 14. März 2024, 17:00–19:00, KG I Foyer
Quantum-clock interferometry — •Mario Montero1, Ali Lezeik1, Klaus Zipfel1, Ernst M. Rasel1, Christian Schubert1,2, and Dennis Schlippert1 — 1Leibniz Universität Hannover, Institut für Quantenoptik — 2Deutsches Zentrum für Luft und Raumfahrt, Institut für Satellitengeodäsie und Inertialsensorik
The Equivalence Principle assumes the Universality of Gravitational Redshift (UGR), which asserts that the ticking rate of two idealized clocks in a gravitational field is independent of their internal composition. High-precision UGR tests confirm General Relativity’s validity but hold the potential to reveal new physics if deviations are found. Quantum-Clock Interferometry (QCI) offers a UGR test based on specific interferometer geometries with delocalised optical clock states to measure differences in proper time affecting the interferometer’s phase [1]. We propose an interferometer geometry sensitive to gravitational redshift that benefits from a common-mode rejection of noise effects.
The feasibility of QCI experiments measuring gravitational redshift depends on the availability of long-lived internal states with large energy difference, making the Yb optical clock transition an ideal candidate. We report on the status of our high-flux source of cooled Yb atoms [2]. The optical transition will be driven by a two-photon E1-M1 Doppler-free excitation, requiring a narrow linewidth and high power light source [3]. Here we present our ultra narrow clock laser at 1156 nm with high powers in excess of 20 W.
[1] PRX QUANTUM 2, 040333 (2023). [2] J. Phys. B: At. Mol. Opt. Phys. 54, 035301 (2021). [3] Phys. Rev. A 90, 012523 (2014).
Keywords: Atom Interferometry; Cold Atoms; Quantum Clocks; Quantum Sensing; Atomic Physics