PT Unknown AU Goltsman, G TI Quantum-photonic integrated circuits SE Proc. IWQO PY 2019 BP 22 EP 23 DE WSSPD; waveguide SSPD; SNSPD; quantum optics; integrated optics; superconducting nanowire single-photon detector AB We show the design, a history of development as well as the most successful and promising approaches for QPICs realization based on hybrid nanophotonic-superconducting devices, where one of the key elements of such a circuit is a waveguide integrated superconducting single-photon detector (WSSPD). The potential of integration with fluorescent molecules is discussed also. ER