Abstract
The theoretical concept of photons is very important for the interpretation of quantum optics experiments. Since Eugene P. Wigner published the important work on the concept of particle localization in relativistic quantum mechanics, it has long been argued in the theoretical literature that photons cannot be exactly located in free space.1 The argument claims that localized photons necessarily have an energy density that drops off as a power law of distance. If this is true, one should seriously examine the experimental consequences of such a claim.
© 1989 Optical Society of America
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