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QI: Fachverband Quanteninformation
QI 3: Quantum Communication
QI 3.1: Vortrag
Montag, 18. März 2024, 09:30–09:45, HFT-TA 441
Quantum Frequency Conversion for Entanglement Distribution — •Tommy Block1,2, Yuya Maeda3, Pooja Malik1,2, Yiru Zhou1,2, Florian Fertig1,2, Chengfeng Xu1,2, Tim van Leent1,2, and Harald Weinfurter1,2,4 — 1Ludwig-Maximilians-Universität, Fakultät für Physik, Schellingstr. 4, 80799 München — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München — 3Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan — 4Max-Planck-Institut für Quantenoptik, 85748 Garching
Entanglement distribution between distant quantum nodes is one of the most crucial tasks for a future quantum network. In our experiment we utilize optical fibers as quantum channels to distribute the entanglement between two Rubidium-87 atom-based quantum memories via entanglement swapping. Since the emission wavelength of our Rb atoms is 780 nm, the photons would suffer high attenuation losses in optical fibers, limiting the maximum achievable distance for entanglement distribution. Here we describe how to convert the 780 nm photons to 1514nm (telecom S-band) with a second generation quantum frequency converter (QFC) with higher stability and signal to noise ratio, while preserving the quantum information encoded in the polarization state of photon. This QFC device will enable distribution of entanglement over suburban distances.
Keywords: Entanglement Distribution; Frequency Conversion