The 326 forum: Quantum Dot Single Photon Sources for Quantum Technologies
Sven H？fling received his diploma degree from the University of Applied Physics and his PhD degree from Würzburg University. During his scientific carrier he has moreover been affiliated with the Fraunhofer Institute of Applied Solid State Physics, Stanford University, the University of Tokyo and the National Institute of Informatics in Tokyo. He is holding personal chairs in physics at the University of Wuerzburg, Germany, and at the University of St Andrews, Scotland. His research is focused on the design, fabrication, characterization and utilization of novel materials and devices.
Sven H？fling is member of OSA, DPG, EPS and IEEE. Furthermore, he is a Committee member of the German Quantum Technology Flagship Initiative (QUTEGA).
Quantum information processing is a rapidly developing research field. The exploitation of quantum bits instead of classical bits offers key advantages for future technologies including secure communication and ultra-fast computation. Lab-size experiments on quantum information processes have already proven the validity of its concepts. However, any wide spread utilization will require dense integration of functionalities. This requires the realization of semiconductor integrated quantum photonic circuits on a single semiconductor chip with embedded sources, photon processing units and detectors on the single photon level. Among the different material platforms currently being investigated, direct-bandgap semiconductors and particularly gallium arsenide (GaAs) offer the widest range of functionalities, including single and entangled-photon generation by radiative recombination, low-loss routing, electro-optic modulation and single-photon detection. We review the current status of quantum integrated photonic components and circuits based on the GaAs technology platform. All key functionalities, including single-photon sources and single-photon detectors, integrated auto-correlators and tuneable Mach-Zehnder interferometers have been realized and tested. These results lay the foundation for a fully-functional and densely integrated quantum photonic technology based on GaAs components.
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