Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.29: Poster
Mittwoch, 13. März 2019, 16:15–18:15, S Fobau Physik
Polarization-Preserving Quantum Frequency Conversion of 40Ca+-Resonant Photons to the Telecom C-Band — •Tobias Bauer, Matthias Bock, Stephan Kucera, Benjamin Kambs, Jürgen Eschner, and Christoph Becher — Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken
In quantum communication networks, the information is stored in quantum nodes, which can be realized e.g. in trapped ions like 40Ca+. By transferring the states onto photons, it is possible to exchange information between these nodes over long distances via optical fiber links. In order to minimize attenuation in fibers, which is particularly high for typical transition frequencies of trapped ions, quantum frequency down-conversion to low-loss telecom bands is utilized.
We present a scheme for polarization-preserving quantum frequency conversion of 40Ca+-resonant photons to the telecom C-band. It relies on the difference frequency generation process 854 nm −1904 nm =1550 nm [1] in a PPLN waveguide, which is arranged in a Sagnac configuration to achieve polarization preservation. We will show the characterization of several key components as well as first results on conversion efficiency and noise count rates.
[1] Krutyanskiy, V. et al., Appl. Phys. B (2017) 123: 228.