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Emission and control of single photons in photonic quantum circuits

We review the experimental progress on the research on quantum dots embedded in planar photonic circuits, which has recently matured to become a platform for fundamental studies of light-matter interaction as well as a serious contender for photonic quantum technology. Recent highlights include the demonstration of deterministic chip-scale single-photon sources and nonlinear optics at the single-photon level. Furthermore, we show that non-reciprocal photonic devices may be constructed using specially engineered waveguides in which, e.g., spontaneous emission becomes unidirectional.