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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Information (Quantum Communication and Quantum Repeater) II

Q 48.6: Vortrag

Donnerstag, 12. März 2020, 15:30–15:45, e001

Performance Optimization Tools for Single-Photon Quantum Key Distribution — •Timm Kupko¹, Martin v. Helversen¹, Lucas Rickert¹, Jan-Hindrik Schulze¹, André Strittmatter^{1, 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)