Quantum 2025 – scientific programme
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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.33: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
InP-based photonic structures at telecom wavelengths for quantum communication — •Mohamed Benyoucef1, Ranbir Kaur1, Johann Peter Reithmaier1, Ryota Katsumi2, Yasutomo Ota3, and Yuming He4 — 1Institute of Nanostructure Technologies and Analytics (INA), CINSaT, University of Kassel, Heinrich-Plett-Street 40, 34132 Kassel, Germany — 2Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan — 3Department of Applied Physics, Keio University, Yokohama 223-8522, Japan — 4Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
Single-photon sources operating at fiber-optic communication wavelengths are essential for transmitting quantum information over long distances. Self-assembled semiconductor quantum dots (QDs) in microcavities that emit in the telecom C-band, where silica fiber losses are minimal, are particularly promising. In this study, we present our recent progress in InP-based photonic structures operating at telecom wavelengths. The fabrication of low-density symmetric QDs is achieved by carefully controlling the QD growth using a special growth technique. Low-temperature single-dot spectroscopy reveals sharp excitonic emission lines with negligible fine structure splitting. These QDs exhibit bright and pure single-photon emission over a wide range of the third telecom window. Furthermore, the hybrid integration of InP-based single-photon sources on a CMOS processed silicon photonic chip is discussed.
Keywords: Single-photon source; quantum photonics; Quantum dots; Telecom C-band; Cavities