Integrated Quantum Optics and Nanophotonics with Defect Centers in Nanodiamonds

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The project aims at making a significant step towards elements for optical quantum information processing. Defect centers in nano-crystalline diamond serve as individual quantum systems providing photons and spin degrees of freedom that can be coupled and manipulated on integrated on-chip quantum circuits. The ultimate purity limit of single-photons from defect centers in diamond nano-crystals will be explored and efficient coupling to integrated on-chip quantum circuits will be studied. The goal is to perform first on-chip quantum gates. Another objective concerns quantum control of few-photon light and optical read-out of single defect centers in strongly confined optical fields. Finally, integrated nanophotonics will be exploited for high-fidelity initialization, manipulation, and single shot read-out of the defect center's spin degree of freedom.