- Fluorescence Lifetime Microscopy with Entangled Photon Pairs - The utilization of the time-frequency correlation of entangled photon pairs enables time-domain fluorescence lifetime microscopy (FLIM) without the need of pulsed illumination of fluorophores. It reduces considerably the risk of photobleaching because continuous-wave illumination with a photon pair intensity of less than 1 nW is sufficient to facilitate this technique. Furthermore, it enables spectroscopic approaches due to the simple tunability of the excitation wavelength by optimization of the photon pair generation process.