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UNIST researchers develop silicon chip-based quantum photonic devices

An international team of researchers, affiliated with UNIST has presented a core technology for quantum photonic devices used in quantum information processing. They have proposed combining of quantum dots for generating light and silicon photonic technologies for manipulating light on a single device. This breakthrough has been led by Professor Je-Hyung Kim in the School of Natural Science at UNIST in collaboration with Professor Edo Waks and a group of researchers at the University of Maryland, United States. In this study, the research team demonstrated the integration of silicon photonic devices with a solid-state single photon emitter. We use a hybrid approach that combines silicon photonic waveguides with InAs/InP quantum dots that act as efficient sources of single photons at telecom wavelengths spanning the O-band and C-band. In classical computing, a bit is a single piece of information that can exist in two states – 1 or 0. Quantum computers uses quantum bits that can occupy 0, 1, or a a superposition that can be both at the same time. Although there are several potentially fruitful approaches exist to quantum information processing based on a variety of quantum technologies, including atom, light, and superconducting devices. However, the future of quantum computing, like the quantum state itself, still remains uncertain. Professor Kim focuses on the quantum information processing, using light. This is because quantum bits can be implemented using the polarized state of light, its duration, and the route information, similar to electron spins. A recently developed quantum light source exhibits… [Read full story]