Abstract
The Pfleegor-Mandel experiment showing the interference between two beams coming from two independent lasers is reviewed. It is argued that the interference fringes detected by Pfleegor and Mandel may not be caused by the interference, which is an interaction between the two beams. Instead of the interference between the two beams coming from two lasers, the following is suggested. The photons coming from the first laser interact with the environment of the path leading from the second laser, and the photons coming from the second laser interact with the environment of the path leading from the first laser. A modification of the Pfleegor-Mandel experiment that eliminates the possible interaction with the path from the other laser is proposed.
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