Freiburg 2019 – wissenschaftliches Programm
FM 84.6: Poster
Donnerstag, 26. September 2019, 16:30–18:30, Tents
Building Blocks for Practical Single-Photon QKD — •Lucas Rickert1, Timm Kupko1, Martin v. Helversen1, Alexander Schlehahn1, Sven Rodt1, Christian Schneider2, Sven Höfling2,3, Stephan Reitzenstein1, and Tobias Heindel1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, United Kingdom
We will present our recent progress in the development of practical devices for quantum communication employing quantum light sources. The first device is a plug-and-play single-photon source (SPS) based on semiconductor quantum dots, integrated in a compact Stirling cryocooler for user-friendly operation. We address efficient direct coupling of electrically operable quantum light sources to optical single-mode fibers, representing one crucial step towards applications. The second device constitutes a receiver module designed for polarization-encoded QKD. We show that temporal filtering of single-photon pulses can be used for a performance optimization of QKD systems implemented with realistic quantum-light sources. Finally, we demonstrate real-time security monitoring using our receiver-module by evaluating g(2)(0) inside the quantum channel.
The results presented here are an important contribution towards the development of QKD-secured communication networks based on quantum-light sources suitable for practical applications.