Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Poster – Quantum Technologies III
Q 66.17: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Rack-mounted ion trap with integrated fiber cavity — •Lara Becker1, Jolan Costard1, Stephan Kucera1,2, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany — 2Luxembourg Institute of Science and Technology, 4362 Belvaux, Luxembourg
Single trapped ions as quantum memories and single photons as quantum information carriers are promising building blocks of quantum networks [1], providing high-fidelity entanglement in controlled single-photon absorption and emission [2]. Ion-photon interfaces are thus a promising platform for implementing a quantum repeater and for connecting quantum processors into a quantum computing network.
Our experimental setup is a multi-segment Paul trap for 40Ca+ ions with an integrated fiber cavity to increase the photon collection and generation efficiency of the interface. The trap consists of two laser-machined and metal-coated ceramic ferrules, into which the fiber cavity with sub-mm spacing is integrated. In a first prototype we integrated a cavity with 220 µm length and 8000 finesse with a trap of 190 µm electrode separation. The trap, together with a laser-beam distribution system, detection optics and control electronics, is mounted in a 19-inch rack. Its future implementation will enable quantum repeater protocols [3] over the Saarbrücken fiber link [4].
[1] M. Bock et al., Nat. Commun. 9, 1998 (2018)
[2] E. Arenskötter, et al., npj Quantum Inf. 9, 34 (2023)
[3] M. Bergerhoff, et al., Phys. Rev. A 110, 032603 (2024)
[4] S. Kucera, et al., npj Quantum Inf. 10, 88 (2024)
Keywords: Cavity ion trap; Trapped ion; Fiber cavity; Quantum repeater cell