Temporal ghost imaging

Ghost imaging in the spatial domain is nowadays a well-known but still a surprising phenomenon. It was demonstrated originally with entangled photon pairs and later with pseudo-thermal light. Very recently it was shown that it is also possible to create ghost images in the time domain using temporally incoherent light. In this case the object is not a spatial mask but a temporally varying modulation of the light. We show a simple experimental setup for temporal ghost imaging that can be implemented even in the undergraduate physics laboratory. Results are very close to the those reported in the first experimental study of this phenomenon.