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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.25: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Towards a two-photon E1-M1 clock transition excitation in ¹⁷⁴Yb — •Mario Montero¹, Ali Lezeik², Dominik Koester², Klaus Zipfel², Ernst M. Rasel², Christian Schubert¹, and Dennis Schlippert² — ¹Institut für Satellitengeodäsie und Inertialsensorik, Deutsches Zentrum für Luft und Raumfahrt, Hannover, Deutschland — ²Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Deutschland

Atom interferometry experiments measuring gravitational redshift require access to long-lived internal states, such as the ¹S₀→ ³P₀ optical transition in group II atoms. An E1-M1 two-photon excitation directly access the clock state from the ground state by coupling to a far detuned intermediate state through a pair of electric and magnetic dipole allowed transitions [1]. This avoids state mixing, enhancing the excited state’s lifetime. Moreover, using counter-propagating photons with degenerate frequencies eliminates first-order Doppler effects.

We report the progress of our experimental setup to drive the clock transition. We prepare an ultra-cold atomic ensemble of ¹⁷⁴Yb through a dual-stage magneto-optical trap sequence, followed by evaporative cooling in a crossed optical dipole trap [2]. To excite the transition, we utilize a high-power (10 W), narrow-linewidth 1156 nm laser system referenced to a high-finesse cavity and a frequency comb.

We discuss further applications of the two-photon Doppler-free excitation as a beam splitting method for quantum clock interferometry experiments.

[1]PRA 90, 012523 (2014). [2]J.Phys.B 54, 035301 (2021).

Keywords: Atom Interferometry; Cold Atoms; Optical Transition; Quantum Sensing; Ytterbium