Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Materials and devices for quantum technology II

HL 39.4: Talk

Wednesday, March 18, 2020, 10:30–10:45, POT 112

Deterministic fabrication of quantum dot single-photon sources with emission in telecom c-band — •Niklas Kanold¹, Andrei Kors², Sven Rodt¹, Johann Peter Reithmaier², Mohamed Benyoucef², and Stephan Reitzenstein¹ — ¹Institute of Solid State Physics, Technische Universität Berlin, Berlin, Germany — ²Institute of Nanostructure Technologies and Analytics, CINSaT, University of Kassel, Kassel, Germany

The availability of reliable single-photon sources (SPS) with emission wavelength compatible with long-range communication in existing fiber-networks is one crucial requirement to implement large-scale quantum key distribution. Beyond that, applications in quantum metrology and information can profit form the availability of such non-classical light sources. Self-assembled semiconductor quantum dots (QDs) are very attractive candidates to realize on-demand SPS as they combine high emission rates with excellent single-photons purity and high indistinguishability, however almost exclusively at emission wavelengths in the 900-950 nm range. Here, we report on the development of QD SPSs in the InAs/InP-material system with emission at 1.55 micron. The QDs are grown via molecular beam epitaxy and include a back-side on a distributed Bragg reflector. We apply in-situ electron-beam lithography to deterministically integrate such QDs e.g. into mesa structures in order to maximize the photon extraction efficiency. The realized telecom SPSs are studied by optical and quantum optical tools to evaluate for instance the single-photon purity of emission.