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Computational ghost imaging has been demonstrated experimentally recently. Inthis comment we wish to clarify the difference between pseudothermal ghostimaging (PGI) and computational ghost imaging (CGI). In particular, toemphasize the physics that arises from the difference in the type of sourcesused. The experiment in [2] is not a PGI experiment but is a simulation of PGI.If we consider CGI at the single photon level, it becomes clear that CGI relieson two identical photons, one real and one simulated, to obtain an image.

Comment on Ghost imaging with a single detector [arXiv0812.2633v2]