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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Information II
Q 60.16: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Polarization-preserving quantum frequency conversion for entanglement distribution in trapped-atom based quantum networks — •Tobias Bauer1, Jan Arenskötter1, Matthias Bock1,2, Stephan Kucera1, Benjamin Kambs1, Jürgen Eschner1, and Christoph Becher1 — 1Universität des Saarlandes, FR Physik, Campus E2.6, 66123 Saarbrücken, Germany — 2Universität Innsbruck, Institut für Experimentalphysik, Technikerstrasse 25/4, A-6020 Innsbruck, Austria
In quantum communication networks information is stored in internal states of quantum nodes, which can be realized e.g. in trapped ions like 40Ca+. 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. In order to minimize attenuation in fibers, which is particularly high for typical transition frequencies of trapped ions, quantum frequency down-conversion of the transmitted photons to low-loss telecom bands is utilized.
We present a high-efficiency, rack-integrated quantum frequency converter for polarization-preserving conversion of 40Ca+-resonant photons to the telecom C-band. It relies on the difference frequency generation process 854 nm - 1904 nm = 1550 nm in a PPLN waveguide, which is arranged in a Sagnac configuration to achieve polarization preservation. We will further present the application of the converter in entanglement distribution experiments, e.g. the distribution of entangled SPDC-photon pairs and quantum state teleportation over large fiber distances.