Quantum 2025 – scientific programme
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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.51: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Rack-mounted ion trap with integrated optical cavity — •Franz Krieger1, Lara Becker1, Jolan Costard1, Stephan Kucera1,2, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany — 2Luxembourg Institute of Science and Technology, 4362 Belveaux, Luxembourg
Single trapped ions as quantum memories and single photons as quantum information carriers are promising building blocks of quantum networks, providing high-fidelity entanglement in controlled single-photon absorption and emission [1]. Ion-photon interfaces are thus well-suited for implementing a quantum repeater [2] that mitigates the propagation loss in direct transmission, and also for connecting quantum processors into a quantum computing network.
We are setting up a multi-segment linear Paul trap for 40Ca+ ions with an integrated fiber cavity that realizes an interface with high photon collection and generation efficiency. We are working on two different designs, a ferrule trap and a glass trap. Both trap types are micro-structured and metal-coated to create a segmented electrode structure and are equipped with a borehole perpendicular to the trap axis to introduce the sub-mm optical cavity. In a first prototype we integrated a cavity with 220 µm length and 11 000 finesse with a trap of 190 µm electrode separation.
With its compact design, the trap-cavity system including the vacuum chamber, control electronics, ablation and photo-ionization laser will be stored in a single transportable rack.
[1] E. Arenskötter, et al., npj Quantum Inf. 9, 34 (2023)
[2] M. Bergerhoff, et al., Phys. Rev. A 110, 032603 (2024)
Keywords: Trapped ion; Quantum repeater; Cavity ion trap; Fiber cavity