SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 6: Poster I (joint session QI/Q)
QI 6.23: Poster
Montag, 6. März 2023, 16:30–19:00, Empore Lichthof
The Ideal Wavelength for Daylight Free-Space Quantum Key Distribution — •Mostafa Abasifard1, Chanaprom Cholsuk1, Roberto G. Pousa2, Anand Kumar1, Ashkan Zand1, Daniel K. L. Oi2, and Tobias Vogl1,3 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany — 2Computational Nonlinear and Quantum Optics, SUPA Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom — 3Fraunhofer-Institute for Applied Optics and Precision Engineering IOF, 07745 Jena, Germany
Quantum key distribution (QKD) has matured from proof-of-principle demonstrations in the lab to commercial systems. Intercontinental quantum communication distances have been bridged with satellites. Satellite-based quantum links can only operate during the night, as the sunlight would otherwise saturate the detectors used to measure the quantum states. For high data rates and continuous availability, operation during daylight is desirable.
We model a satellite-to-ground quantum channel for the BB84 protocol in order to determine the optimal wavelength for daytime free-space QKD. We look at the 400 nm to 1700 nm wavelength range and find extractable secret bits per signal for several light sources. As expected, the Fraunhofer lines appear as peaks in the spectrum of the secure data rate. For the ideal wavelength, we also propose a true single photon source, based on a resonator coupled color center in hexagonal boron nitride.