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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.3: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

Coherent Photon Number State Superpositions in Frequency Converted Photons from SnV Color Centers — •Tobias Bauer, Dennis Herrmann, Marlon Schäfer, David Lindler, Robert Morsch, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken

Photon-number coherence (PNC) represents both a powerful resource and a potential security concern for optical quantum technologies: it enables encoding and manipulation of information in the photon-number degree of freedom [1], while deviations from ideal one-photon states can compromise the security of quantum communication protocols [2]. Recent advances with semiconductor quantum dots have shown that coherent driving can generate photon-number superpositions on demand with high purity [3], providing deterministic access to vacuum-one-photon states and opening new possibilities for advanced quantum information processing.
We extend these concepts to color centers in diamond by generating coherent photon-number state superpositions from a SnV-center using resonant excitation with varying pulse powers. We further demonstrate that these states are preserved after frequency conversion of the SnV-resonant photons to the telecom C band.

[1] Polacchi, B., Hoch, F., Rodari, G. et al., npj Nanophoton. 1, 45 (2024). [2] Karli, Y., Vajner, D.A., Kappe, F. et al., npj Quantum Inf 10, 17 (2024). [3] Loredo, J.C., Antón, C., Reznychenko, B. et al., Nat. Photonics 13, 803*808 (2019).

Keywords: Quantum Frequency Conversion; SnV; Photon Number Coherence