After decades of intense research on quantum information science worldwide physicists have successfully harnessed the peculiar properties of quantum world for quantum technology with the help of photonic technology, laser manipulations, nonlinear optical materials and metastructures. Quantum nonlinear optics, the marriage of quantum physics and intense light fields, enables the coexistence of quantum effects in strong fields, has opened up exciting new possibilities, such as miniaturizing quantum technology in integrated optical chips. This conference is intended to bring together leading experts, researchers and students in the fields to share their knowledge and innovations, discuss ideas and problems, leading to the advancement of quantum and nonlinear optical science and technology.