Quantum 2025 – wissenschaftliches Programm

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TUE: Tuesday Contributed Sessions

TUE 2: Quantum Networks: Technologies

TUE 2.3: Vortrag

Dienstag, 9. September 2025, 14:45–15:00, ZHG002

Building Blocks for Hybrid Quantum Repeaters — •Marlon Schäfer, Tobias Bauer, Pascal Baumgart, Max Bergerhoff, Christian Haen, Dennis Herrmann, David Lindler, Jonas Meiers, Robert Morsch, Jürgen Eschner, and Christoph Becher — Universität des Saarlandes, Fachrichtung Physik, Campus E2 6, 66123 Saarbrücken

Large-scale quantum networks require the development of quantum repeaters capable of high-fidelity entanglement distribution over long distances. We report progress toward heterogeneous quantum repeater nodes that integrate solid-state and atomic platforms. Specifically, tin-vacancy (SnV) centers in diamond and trapped calcium ions (⁴⁰Ca⁺) are employed as quantum memories, with quantum frequency conversion bridging their respective emission to the low-loss telecom band. We demonstrate frequency conversion of indistinguishable photons from SnV centers and ⁴⁰Ca⁺ ions, and present results on quantum interference between photons emitted by these systems. To evaluate performance under realistic conditions, we operate a 14 km-long urban fiber testbed with a stable frequency reference frame distributed over the fiber link. These results represent critical steps toward scalable, hybrid quantum repeater architectures.

Keywords: Quantum Network; Quantum Repeater; Trapped ions; Color Centers in Diamond