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QI: Fachverband Quanteninformation
QI 37: Poster – Quantum Information Technologies (joint session Q/QI)
QI 37.8: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Fabricating Tapered Optical Fibres for Quantum Networks — •Lasse Jens Irrgang1, Timo Eikelmann1, Mara Brinkmann1, Tuncay Ulas1, Donika Imeri1,2, Konstantin Beck1, Sunil Kumar Mahato1, Rikhav Shah1,2, and Ralf Riedinger1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
On the journey towards a quantum internet, the development of reliable quantum repeaters and quantum end-nodes is essential. Particularly well suited for usage as quantum bits for storing and processing quantum information in these applications are silicon vacancies in diamond. Crucial for this approach is a coupling of photonic quantum channels to the diamond, where the latter serves as a waveguide.
A recent solution for this challenge, outshining traditional methods, is the so-called adiabatic mode coupling using optical fibres. In this technique, a tapered optical fibre is positioned in contact with the top surface of the diamond waveguide, enabling highly efficient adiabatic coupling of light between the two waveguides. Presented here, is an automated etching setup for the fabrication of these tapered fibres. The silica glass etching process is based on hydrofluoric acid solution. The developed automated etching setup evidentially facilitates the fabrication of linearly tapered fibres with smooth etched surfaces. The customizable taper extends up to a few millimetres, corresponding to an angle of less than one degree between the fibre's centre axis and the tapered surface.
Keywords: Adiabatic Coupling; Silicon Vacancy; Quantum Networks; Tapered Optical Fibres