Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum Information (Quantum Communication) I

Q 28.1: Talk

Wednesday, March 16, 2022, 10:30–10:45, Q-H12

Propagation of orbital-angular-momentum photons across satellite-to-earth downlinks — •Jan Schreck, David Bachmann, Vyacheslav Shatokhin, and Andreas Buchleitner — Physikalisches Institut Albert-Ludwigs Universität, Hermann-Herder-Str. 3, 79104 Freiburg

Satellite-based quantum communications enable global-scale information security. Most communication systems are based on two-dimensional encoding which employs photonic spin angular momentum (SAM). Instead, photonic spatial modes endowed with orbital angular momentum (OAM) offer high-dimensional encoding, which enhances the channel capacity, and the security of quantum key distribution (QKD) protocols. However, OAM is very fragile with respect to turbulence-induced phase front distortions.

In this talk, we discuss a faithful numerical method to account for atmospheric effects on OAM beams for a broad range of turbulence conditions. We then present our simulations of beam propagation through slant atmospheric channels, and identify turbulence regimes where high-dimensional communication using OAM beams is possible.