Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.2: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Raman laser system for controlling 9Be+ ion qubits — •Simon Roßmann1, Timko Dubielzig1, Sebastian Halama1, Giorgio Zarantonello1,2, Henning Hahn1,2, Amado Bautista-Salvador1,2, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universtiät Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
We operate a cryogenic surface-electrode ion trap setup for 9Be+ ions. In our project, logic operations are typically carried out using integrated near-field microwave conductors; for bootstrapping and ground state cooling, we employ stimulated-Raman laser pulses. The light for this system is provided via sum-frequency generation of two tunable infrared fiber lasers and a subsequent second harmonic generation. The second harmonic stage is realized using a monolithic cavity design, similar to [1]. The generated 313 nm light is power stabilized and split into two beams. Each of those is frequency shifted in a double-pass AOM setup to realize two beams with a frequency difference of 1083 MHz, corresponding to our qubit transition. To avoid beam pointing fluctuations caused by duty cycle dependent temperature changes within the AOMs [2], we have developed a setup that can cancel this jitter.
[1] S. Hannig et al., Rev. Sci. Instrum. 89, 013106 (2018)
[2] Yiheng Lin, PhD Thesis, CU Boulder (2015)