SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: QI Poster I (joint session QI/Q)

Q 8.22: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Towards quantum communication over intercity optical fiber link — •Ali Hreibi, Ann-Kathrin Kniggendorf, Harald Schnatz, and Stefan Kück — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig

We report on the status of the PTB's work to establish a quantum communication test bed between Braunschweig and Hanover (the "Niedersachsen Quantum Link"). In this context, we present an overview of the quantum key distribution (QKD) system based on the BBM92 protocol set up at PTB and the test of quantum communication via optical fiber up to 90 km in length. The QKD system generates Polarization-entangled photon pairs using the nonlinear optical process of spontaneous parametric down-conversion, and transmits the entangled photon pairs (signal, and idler) to a local and a remote location through the optical fiber. Photons are detected on both sides and measurement data is processed by the system in order to generate a secure quantum encryption key. The Communications security relies on the laws of quantum mechanics and the non-cloning theorem which prevents a quantum state from being copied or measured without disturbing it.