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QI: Fachverband Quanteninformation
QI 13: Quantum Networks, Repeaters, and QKD II (joint session Q/QI)
QI 13.6: Vortrag
Dienstag, 11. März 2025, 12:15–12:30, AP-HS
Outlining the design for the receiver module for a scalable free-space quantum network — •Karabee Batta1,2, Michael Steinberger1,2, Moritz Birkhold1,2, Adomas Baliuka1,2, Harald Weinfurter1,2,3, and Lukas Knips1,2,3 — 1Ludwig Maximilian University (LMU), Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Max Planck Institute of Quantum Optics (MPQ), Garching, Germany
QKD leverages principles of quantum mechanics to generate encryption keys that are resistant to eavesdropping. Here, we present the design for a modular receiver unit to establish secure quantum links for polarization-encoded quantum states for ground-based and low-earth orbit satellite systems. The receiver addresses key challenges, such as polarization drift and spatial mode mismatch, which are critical for maintaining high-fidelity quantum links. It does so by employing automated polarization-compensation mechanisms and spatial filtering to avoid dedicated QKD attacks. A key application of this will be communication with the QUBE-II satellite.
Keywords: Quantum Communication; Polarisation Compensation; Free-space Quantum Networks; Quantum Key Distribution; Spatial Filtering