Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: Focus Session: Quantum light sources for applications in quantum communication networks
HL 26.7: Talk
Wednesday, April 3, 2019, 12:15–12:30, H34
Receiver Module for QKD using Real-Time Security Monitoring with Single-Photon Sources — •Timm Kupko, Lucas Rickert, Stephan Reitzenstein, and Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
Solid-state single-photon sources have the potential to boost the performance of quantum-key-distribution (QKD) systems [1]. The security of QKD, however, critically relies on the performance of the quantum light source [2]. In addition, many attacks are known for trusted-device QKD, making a profound security analysis mandatory.
Here, we evaluate the performance of a receiver module designed for free-space polarization-encoded QKD via the BB84 protocol using solid-state single-photon sources. The receiver module is tested with respect to the susceptibility to spatial-side-mode channel attacks. Furthermore, we analyze the effect of temporal filtering on the performance of QKD systems implemented with realistic quantum-light sources. A trade-off between quantum bit error rate and sifted key rate is necessary to achieve optimum performance. Finally we show, that real-time monitoring of the antibunching g(2)(0) inside the quantum channel enables a convenient security assessment during key generation. Our work lays the basis 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)