Regensburg 2022 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

QI: Fachverband Quanteninformation

QI 1: Implementations: Spin Qubits, Atoms, and Photons

QI 1.7: Talk

Monday, September 5, 2022, 11:30–11:45, H8

Quantum-optical Characterization of Single-photon Sources based on Chlorine-doped ZnSe/ZnMgSe Nanopillars — •Christine Falter, Yurii Kutovyi, Nils von den Driesch, Thorsten Brazda, Detlev Grützmacher, and Alexander Pawlis — Peter Grünberg Institute PGI-9, Forschungszentrum Jülich GmbH

The realization of optical quantum computers and secure quantum communication networks requires the development of efficient and scalable sources of single, indistinguishable photons that can be integrated onto photonic chips. Here we report on a novel type of single-photon source (SPS) device based on individual Cl donors in ZnSe/ZnMgSe quantum well nanopillars. On top of each nanopillar a solid immersion lens is fabricated, employing the photoresist previously used to define the nanopillars. For optimized conditions the external quantum efficiency is increased by up to one order of magnitude. Excitation-power-dependent photoluminescence measurements confirm that the emission stems from a true two-level system and the single photon purity of the source is verified by measuring the second order correlation function. Finally, we investigate the grade of sequential indistinguishability of subsequent single-photons from our devices by Hong-Ou-Mandel type experiments. This work paves the way for efficient generation of polarization entanglement between two sufficiently indistinguishable photons. Consequently, future applications of these SPSs are envisioned in all-optical based quantum cryptography or to interconnect distant nodes in quantum networks.