Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.27: Poster
Wednesday, March 13, 2024, 17:00–19:00, KG I Foyer
Polarization-Preserving Quantum Frequency Conversion of 40Ca+-Resonant Photons to the Telecom C-Band — •Tobias Bauer, David Lindler, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken
In quantum communication networks information is stored in internal states of quantum nodes, which can be realized e.g. in trapped ions like 40Ca+ [1] or SnV color centers in diamond [2]. By transferring the states onto flying quantum bits, i.e. photons, it is possible to exchange information between these nodes over long distances via optical fiber links. Utilizing quantum frequency conversion to a common target wavelength enables the entanglement of dissimiliar quantum memories and drastically reduces fiber attenuation by choosing a target wavelength in a low loss telecom band.
We present a high-efficiency, rack-integrated quantum frequency converter for polarization-preserving conversion of 40Ca+-resonant photons to the telecom C-band. This converter is highly suited for real-world applications in urban area fiber networks, e.g. photonic entanglement distribution [3] or creation of remote entanglement of atomic systems. We will also show first progress towards the entanglement of a 40Ca+-ion with a SnV center by stabilizing the mixing lasers for both conversion processes to a common frequency reference.
[1] C. Kurz et al., Phys. Rev. A. 93, 062348 (2016)
[2] J. Görlitz et al., npj Quant.Inf. 8, 45 (2022)
[3] E. Arenskötter, T. Bauer et al., npj Quantum Inf 9, 34 (2023)
Keywords: Quantum Frequency Conversion; Polarization Preserving; 40Ca+; SnV; Entanglement