SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantum Communication (joint session Q/QI)
Q 15.7: Talk
Monday, March 6, 2023, 18:30–18:45, F442
A 3km free-space link in the munich quantum network — •Michael Auer1,2,3, Adomas Baliuka1,2, Fabian Farina3, Peter Freiwang1,2, Swantje Kastrup3, Hedwig Körfgen3, Hanns Zimmermann3, Nils gentschen Felde3, Lukas Knips1,2,4, Udo Helmbrecht3, and Harald Weinfurter1,2,4 — 1Ludwig-Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology, Munich, Germany — 3Universität der Bundeswehr München, Neubiberg, Germany — 4Max-Planck-Institut für Quantenoptik, Garching, Germany
Quantum key distribution (QKD) enables secure key exchange, based on fundamental laws of quantum mechanics. Widespread commercial use of this technology requires robust and scalable QKD modules paired with underlying infrastructure and proper key management.
The MuQuaNet aims to build, test and operate a secure quantum communication network with multiple nodes by employing a heterogeneous framework using various manufacturers and provide this network as a transparent service to other institutes, authorities and offices.
Here, we focus on a 3km optical free-space link using a small-size, low-power, FPGA-controlled decoy-state BB84 QKD sender operating at 850nm and 100MHz. With a modulated 1550nm beacon laser, active beam stabilization using two fast steering mirrors, synchronization as well as classical communication is achieved. This will show how to integrate individual QKD links into a network or key management solution and will yield insights to long-term effects and maintainability of QKD devices outside a well controlled environment.