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QI: Fachverband Quanteninformation

QI 32: Quantum Communication II: Implementations (joint session QI/Q)

QI 32.8: Vortrag

Donnerstag, 13. März 2025, 16:15–16:30, HS IX

Dynamic Polarization State Preparation for Single-Photon Quantum Cryptography — •Anastasios Fasoulakis, Koray Kaymazlar, Martin von Helversen, and Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

Quantum Key Distribution (QKD) is the most developed application in the field of quantum information science. Prepare-and-measure type protocols thereby rely on a fast, random qubit-state preparation. In this contribution we discuss our progress in the development of fast polarization-state encoders for single-photon implementations of BB84-QKD as well as cryptographic primitives beyond QKD. Using high-bandwidth free-space optical as well as fiber-based electro-optical modulators in combination with commercial and self-built control-electronics, solid-state quantum light sources emitting at different wavelengths can be modulated. We characterise and optimise the system's performance in terms of its extinction ratio and repetition rate and gauge its potential applications in future QKD systems.

Keywords: QKD; Dynamic Modulation