Our paper entitled A fiber-coupled quantum-dot on a photonic tip was published in Applied Physics Letters. In the manuscript we present the experimental realization of a quantum fiber-pigtail. The device consists of a semiconductor quantum dot bonded to the end of an optical fibre. The quantum dot is embedded in a photonic “trumpet” to ensure good mode-matching to the mode in the optical fibre. We demonstrate a photon collection efficiency at the output of the fiber of 5.8% and suggest realistic improvements for the implementation of a useful device in the context of quantum information. We also discuss potential applications in scanning probe microscopy. The approach is generic and transferable to other materials including diamond and silicon. The research represents a collaboration between three groups in Basel (Poggio, Maletinsky, Warburton), two groups in Grenoble (photonic trumpet fabrication) and a group at Technical University of Denmark (photonic modeling). A video showing the fabrication process can be found here.
Andreas Kuhlmann starts today at IBM, Rüshlikon in the team of Andreas Fuhrer. Andreas was RJW’s first PhD student in Basel, subsequently a post-doc in the group. We shall miss him but wish him well with his new job, incidentally a QSIT-funded project.