Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster – Quantum Technologies II & Laser Technology
Q 41.8: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG
Characterization of photonic qubit conversion from polarization to time-bin in the telecom range — •Julian Groß-Funk1,2, Christian Haen1, and Jürgen Eschner1 — 1Universität des Saarlandes, Experimentalphysik, 66123 Saarbrücken, Germany — 2see below
Many photonic quantum memory implementations rely on the time-bin degree of freedom, which protects against decoherence in fiber transmission, in contrast to polarization encoding. Time-bin qubits, however, lack compatibility with photonic polarization qubit implementations, such as single photons emitted by single trapped ions [1].
In this poster, we present a fiber-based converter for photonic 1550 nm polarization qubits to the time-bin degree of freedom, enabling quantum experiments between different platforms. The fundamental setup is based on an unbalanced interferometer for conversion and a second one for measurement and reconstruction of the converted states. The 18 m imbalance of the interferometer arms induces a sensitivity to temperature variations in the millikelvin range, that we compensate by an active temperature and phase stabilization scheme based on a reference laser beam.
We investigate the influence of the temperature on the reconstruction fidelity, characterize the device by its ability to preserve the quantum information and evaluate its performance with regard to other applications.
[1] M. Bock et al., Nature Commun. 9, 1998 (2018).
2 presently at German Aerospace Center (DLR), Institute of Quantum Technologies, 89081 Ulm, Germany
Keywords: Quantum information