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QI: Fachverband Quanteninformation
QI 32: Quantum Communication II: Implementations (joint session QI/Q)
QI 32.3: Talk
Thursday, March 13, 2025, 15:00–15:15, HS IX
Optical system for bi-directional tracking in free-space quantum key distribution link — •Akhil Gupta1,4, Michael Auer1,3,4, Michael Steinberger1,4, Adomas Baliuka1,4, Moritz Birkhold1,4, Manpreet Kaur1,2,4, Harald Weinfurter1,2,4, and Lukas Knips1,2,4 — 1Ludwig Maximilian University of Munich, Munich, Germany — 2Max Planck Institute of Quantum Optics, Garcing, Germany — 3Universität der Bundeswehr München , Munich, Germany — 4Munich Center for Quantum Science and Technology, Munich, Germany
Quantum Key Distribution (QKD) offers a secure alternative to traditional cryptographic algorithms to generate shared secret keys. We aim to establish a secure ground-to-ground communication on the few kilometers scale using simple and sturdy systems. This talk highlights the critical role of telescopes in free-space communication, enabling efficient signal transmission and reception. Our symmetrical telescope design functions as both transmitter and receiver, optimized for 850 nm (QKD signal) and 1550 nm (tracking, synchronization, and classical communication). The system addresses atmospheric challenges to ensure bidirectional stability, enabling low-loss transmission for reliable and secure quantum communication.
Keywords: QKD; Telescope; Free-space; BB84