V Photon Wave Function
Abstract
This chapter describes the photon wave function, and explains the basic properties of a welldefined mathematical objecta sixcomponent function of spacetime variablesthat describes the quantum state of the photon. The most essential property that does not hold for the photon wave function is that the argument of the wave function cannot be directly associated with the position operator of the photon. The position operator for the photon simply does not exist. However, one should remember that for massive particles also, the true position operator exists only in the nonrelativistic approximation. The concept of localization associated with the NewtonWigner position operator is not relativistically invariant. The photon wave function is not restricted to the wave mechanics of photons. The same wave functions also appear as mode functions in the expansion of the electromagnetic field operators.
 Publication:

Progess in Optics
 Pub Date:
 1996
 DOI:
 10.1016/S00796638(08)703160
 Bibcode:
 1996PrOpt..36..245B