Fluorescence Lifetime Measurements using Entangled Photons from a Continuous-Wave Source

The investigation of fluorescence lifetime became an important tool in biology and medical science. So far, established methods of fluorescence lifetime measurements require the illumination of the investigated probes with pulsed or amplitude-modulated light. In this study, we examine the limitations of an innovative method of fluorescence lifetime using the strong time-frequency correlation of entangled photons generated by a continuous-wave source. For this purpose, we investigate the lifetime of IR-140 to demonstrate the functional principle and its dependencies on different experimental parameters. We also compare this technique with state-of-the-art FLIM and observed an improved figure-of-merit. Finally, we discuss the potential of a quantum advantage. This poster represents a summary of the study published as a peer-review paper in the journal "Methods in Microscopy", vol. 2, issue 1, p. 133-145, https://doi.org/10.1515/mim-2025-0001.