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QI: Fachverband Quanteninformation

QI 6: Poster I (joint session QI/Q)

QI 6.19: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Night Sky Background Measurement for Quantum Key Distribution — •Rengaraj Govindaraj^1,2, Michael Auer^1,2,3, Adomas Baliuka^1,2, Peter Freiwang^1,2, Lukas knips^1,2,4, and Harald Weinfurter^1,2,4 — ¹Fakultät für Physik, Ludwig-Maximilians-Universität, 80799, München, Germany — ²Munich Center for Quantum Science and Technology, 80799, München, Germany — ³Universität der Bundeswehr, 85577 Neubiberg, Germany — ⁴Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany

Free-space satellite-to-ground quantum key distribution (QKD) enables two authenticated parties - potentially separated by global distances - to exchange a secret key that can be used for symmetric cryptography. However, the performance of free-space QKD crucially depends on the quantum bit error ratio (QBER) and hence on the contributions of background light sources such as light from natural sources as the sun or stars as well as from artificial light sources. As those noise contributions vary with time of day, season, weather and location, their study is important for estimating future QKD missions. We here present our experimental method to map the night sky background in terms of its brightness in the spectral bands around 850nm and 1550nm and discuss the implications for satellite-based QKD.