Regensburg 2022 – scientific programme
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QI: Fachverband Quanteninformation
QI 4: Poster: Quantum Information
QI 4.31: Poster
Monday, September 5, 2022, 18:00–20:00, P2
Single Photon Sources at Telecom Wavelengths — •Jonas Grammel1, Dario Mekle1, András Laukó1, Thomas Herzog2, Simone Luca Portalupi2, Peter Michler2, and David Hunger1 — 1Physikalisches Institut, Karlsruher Institut für Technologie — 2Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart
Semiconductor single photon sources are fundamental building blocks for quantum information applications. The current limitations of such quantum dot sources are the emitting wavelength and insufficient collection efficiency in fiber-based implementations. In the project Telecom Single Photon Sources we aim to realize high brightness, fiber coupled sources of single and indistinguishable photons at the telecom wavelength for the upcoming realization of fiber-based quantum networks. We employ open cavities realized with fiber-based mirrors, in combination with InGaAs quantum dots emitting in the telecom O-band and C-band. To achieve Fourier-limited photons we utilize the lifetime reduction of the emitters via the Purcell effect. We optimize the mode matching between the cavity mode and the guided fiber mode by introducing a fiber-integrated mode-matching optics that can basically reach near-unity collection efficiency. Fundamentally new is also the combination of Fabry-Perot micro-cavity modes with lateral micro and nano structures to reduce the cavity mode volume and thereby boost the emission enhancement and efficiency of the single photon emitters.