SAMOP 2021 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 5: Implementations: Solid State Systems
QI 5.4: Vortrag
Dienstag, 21. September 2021, 15:15–15:30, H4
Evaluating Atomically Thin Quantum Emitters 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
Single photon 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 based on a strain-engineered WSe2 monolayer [1] for quantum key distribution (QKD). Employed in a QKD-testbed emulating the BB84 protocol, we analyze the single-photon purity in terms of g(2)(0) and secret key rates as well as quantum bit error rates to be expected in full implementations of QKD. Furthermore, we exploit routines for the performance optimization previously applied to quantum dot based single-photon sources [2]. Our work represents a major step towards the application of TMDC-based devices in quantum technologies.
[1] L. Tripathi et al., ACS Photonics 5, 1919-1926 (2018)
[2] T. Kupko et al., npj Quantum Inform. 6, 29 (2020)