Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Materials and devices for quantum technology II
HL 39.2: Talk
Wednesday, March 18, 2020, 10:00–10:15, POT 112
Tools for the Performance Optimization of Single-Photon Quantum Key Distribution — Timm Kupko1, Martin v. Helversen1, Lucas Rickert1, Jan-Hindrik Schulze1, André Strittmatter1,2, Manuel Gschrey1, Sven Rodt1, Stephan Reitzenstein1, and •Tobias Heindel1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Institut für Experimentelle Physik,Otto-von-Guericke Universität Magdeburg, 39106 Magdeburg, Germany
Solid-state quantum light sources have the potential to boost quantum communication [1,2]. Here, we report on tools to optimize the performance of quantum key distribution (QKD) implemented with single-photon sources (SPSs). We analyze the performance of a receiver module designed for polarization-encoded QKD using deterministically-fabricated quantum dot SPSs. Exploiting two-dimensional temporal filtering and real-time security monitoring, we analyze the sifted key fraction, the quantum bit error ratio, and g(2)(0) expected in full implementations of the BB84 protocol as a function of the acceptance time-window. This routine enables us to choose optimal filter settings depending on the losses of the quantum channel [3]. Our findings are relevant for the development of QKD-secured communication networks based on quantum-light sources.
[1] T. Heindel et al., New J. Phys. 14, 083001 (2012)
[2] E. Waks et al., Phys. Rev. A 66, 042315 (2002)
[3] T. Kupko et al., arXiv:1908.02672 (2019)