Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 8: Photons and Photonic Quantum Processors
QI 8.4: Vortrag
Montag, 18. März 2024, 17:30–17:45, HFT-FT 131
Investigation of the degree of sequential indistinguishability of ZnSe-based single-photon sources — •Christine Falter1,3, Yurii Kutovyi1,3, Nils von den Driesch2,3, Detlev Grützmacher1, and Alexander Pawlis1,2,3 — 1Peter Grünberg Institute PGI-9, Forschungszentrum Jülich GmbH — 2Peter Grünberg Institute PGI-10, Forschungszentrum Jülich GmbH — 3JARA-Fundamentals of Future Information Technology, Jülich Aachen Research Alliance
The realization of secure quantum communication networks requires the development of efficient and scalable sources of single, indistinguishable photons. We recently demonstrated highly efficient and spectrally tunable single photon emission from spatially isolated Cl donors in ZnSe/ZnMgSe quantum well nanopillar structures covered with a resist mask. Photoluminescence measurements reveal a high photon extraction efficiency (PEE) of 16%. Utilizing 2D ray-tracing simulations, we estimate the internal quantum efficiency to be close to unity, which is confirmed by the short radiative lifetime of our emitters. Finally, we investigate the degree of indistinguishability using Hong-Ou-Mandel-type experiments. We employ Monte Carlo simulations to replicate the experimental signatures and to investigate the influence of various experimental factors on the measurements. We estimate the degree of sequential indistinguishability to be as high as 90%. This result paves the way for Cl-doped ZnSe/ZnMgSe nanopillars to serve as highly efficient SPSs in future quantum communication networks.
Keywords: Single-Photon-Source; Indistinguishability; Quantum Communication; Semiconductors; ZnSe