SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: 2D Materials I (joint session HL/CPP)
CPP 5.7: Talk
Monday, March 27, 2023, 11:15–11:30, POT 81
Evaluating Atomically Thin Single-Photon Sources for Quantum Key Distribution — •Timm Gao1, Martin v. Helversen1, Carlos Anton-Solanas2, Christian Schneider2, and Tobias Heindel1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26111 Oldenburg, Germany
Quantum light sources are considered key building blocks for future quantum communication networks. In recent years, atomic monolayers of transition metal dichalcogenides (TMDCs) emerged as a promising material platform for the development of compact quantum light sources. In this work, we evaluate for the first time the performance of a single-photon source (SPS) based on a strain engineered WSe2 monolayer [1] for applications in quantum key distribution (QKD) [2]. Employed in a QKD-testbed emulating the BB84 protocol, an antibunching of g(2)(0)=0.127±0.001 and a raw key rate of up to (66.95±0.10 )kHz make this source competitive with previous SPS based QKD experiments using quantum dot based SPSs. Furthermore, we exploit routines for the performance optimization previously applied to quantum dot based single-photon sources [2]. Our work represents an important step towards the application of TMDC-based devices in quantum technologies.
[1] L. Tripathi et al., ACS Photonics 5, 1919-1926 (2018)
[2] T. Gao et al., arXiv:2204.06427 (2022)
[3] T. Kupko et al., npj Quantum Information 6, 29 (2020)