Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 81: Quantum Communication, Networks, Repeaters, & QKD III
Q 81.2: Vortrag
Freitag, 6. März 2026, 14:45–15:00, P 10
Polarization to time-bin conversion for ion-photon entanglement — •Christian Haen1, Julian Groß-Funk1,2, Max Bergerhoff1, Pascal Baumgart1, Tobias Bauer1, Christoph Becher1, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany — 2see below
Conversion between photonic polarization qubits and time-bin qubits enables the creation of hybrid quantum networks using different quantum memory platforms such as ions and color centers, that provide different inherent types of memory-photon entanglement. For large-scale networks, time-bin encoded quantum information is also less susceptible to polarization changes.
Here, we demonstrate the preservation of ion-photon entanglement after conversion from polarization to time-bin qubits using a telecom fiber-based encoding interferometer. We utilize a single 40Ca+ ion in a Paul trap as quantum memory to generate photons that are polarization-entangled with the ion. Additionally, we use quantum frequency conversion to 1550 nm, which is the operating wavelength of the qubit converter, enabling low loss transmission over large distance telecom fiber links [1]. A second quantum frequency converter is used to finally return to the ion transition wavelength.
[1] S. Kucera et al., npj Quantum Inf. 10, 88 (2024).
2 presently at German Aerospace Center (DLR), Institute of Quantum Technologies, 89081 Ulm, Germany
Keywords: quantum network; coversion; entanglement