Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 7: Quantum Communication and Networks

QI 7.9: Vortrag

Mittwoch, 7. September 2022, 17:15–17:30, H8

Employing Atomically-thin Single-Photon Sources in Quantum Communication — •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

Confined excitons in monolayers of transition metal dichalcogenides (TMDCs) emerged as a novel type of quantum emitter showing appealing prospects for large-scale and low-cost device integration for quantum information technologies. Here, we pioneer the practical suitability of TMDC devices in quantum communication by evaluating the performance of a single-photon source (SPS) based on a strain engineered WSe₂ monolayer for applications in quantum key distribution (QKD) [1]. Employed in a QKD-testbed emulating the BB84 protocol we achieve raw key rates of up to 66.95 kHz and antibunching values down to 0.034 - competitive with QKD experiments using semiconductor quantum dots or color centers in diamond [2]. Furthermore, we exploit routines for the performance optimization developed in our group. Our work thus sets the direction for wider applications of emerging materials in quantum information processing.

[1] T. Gao, M. v. Helversen, C. Anton-Solanas, C. Schneider, and T. Heindel, Atomically-thin Single-photon Sources for Quantum Communication, arXiv:2204.06427 (2022)

[2] D. Vajner et al., Adv. Quantum Technol. 2100116 (2022).