Parametric all-optical modulation on a chip

The authors demonstrate all-optical modulation on a chip, which is important for scalable all-optical information processing and quantum computing, as it supports fan-out and cascaded operations. Using quantum Zeno blockade, logical operations are realized in an interaction-free manner, solely through parametric nonlinear optics. This scheme can thus be implemented at room temperature and on highly integrated chips, as opposed to approaches using single emitters, where cryogenic cooling is required.