Our group at KTH generates, manipulates and detects single photons with nanodevices. We rely on semiconductor quantum dots to generate single photons as well as pairs of entangled photons, here we place emphasis on the purity of the single photon states as well as the ability to tune the emission frequency of various quantum dots to reach atomic transitions or telecom wavelengths. Integrated photonics circuits allow for the manipulation of single photons on a chip and for complex future architectures. Detection of single photons is also performed with nanostructures, superconducting nanowires that offer unprecedented performances in terms of detection efficiency and time resolution, we develop these detectors and implement them in our experiments while the physical process underlying detection remains to be understood. Additional presentations will be given by members of our group in the future.