Space-time multiplexing for ultrafast quantum imaging

We propose a novel ultrafast quantum imaging technique enabled by mapping time bins and structured spatial correlations. In this approach a train of N biphoton time bins marked with a N different spatial phases, produce N different correlation structures that are reconstructed with a single-photon avalanche diode (SPAD) camera. By post-selecting on the different biphoton correlation structures, one can reconstruct the temporal evolution of a scene with picosecond resolution independently of the camera’s framerate. This advancement will allow the imaging of ultrafast transient phenomena in low-light settings, enabling the study of light interactions in fragile biological systems.