Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Communication, Networks, Repeaters, & QKD II
Q 60.3: Vortrag
Donnerstag, 5. März 2026, 15:15–15:30, P 10
Quantum repeater segment based on trapped ions with telecom interface — •Max Bergerhoff, Pascal Baumgart, Jonas Meiers, Christian Haen, Tobias Bauer, Christoph Becher, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany
The quantum repeater (QR) segment enables the connection between distant quantum computers and is, as part of a QR link [1], a fundamental building block for the realization of large-distance quantum networks. By dividing a transmission link in segments and cells [2], it is possible to overcome the exponential attenuation of direct transmission. To reduce losses, the photonic channel must operate at telecom wavelength.
We report on the implementation of a QR segment with free-space coupled photons from two 40Ca+ ions in the same Paul trap as quantum memories. Atom-photon entanglement is generated [3] by controlled emission of single 854-nm photons from the ions after excitation with nanosecond laser pulses and separate single-mode fiber coupling.
Atom-atom entanglement is then generated by a photonic Bell-state measurement after conversion of the 854 nm photons to 1550 nm.
In this context, the perspective of a heterogeneous QR segment using a trapped 40Ca+ ion and a SnV color center in diamond is discussed.
[1] P. van Loock et al., Adv. Quantum Technol., 3: 1900141 (2020).
[2] M. Bergerhoff et al., Phys. Rev. A 110, 032603 (2024).
[3] M. Bock et al., Nat. Commun. 9, 1998 (2018).
Keywords: Quantum repeater; Trapped ion; Atom-photon entanglemet; Entanglement swapping; Atom-atom entanglemet