  An explanation of polarization entanglement is presented using Maxwells
classical electromagnetic theory.Two key features are required to understand
these classical origins.The first is that all waves diffract and weakly
diffracting waves,with a principal direction of propagation in the laboratory
frame, travel along that direction at speeds ever so slightly less than c.This
allows nontrivial Lorentz transformations that can act on selected forward F
waves or selected waves R traveling in the opposite direction to show that both
can arise from a single zero momentum frame where all the waves are transverse
to the original principal direction.Such F and R waves then both belong to a
single relativistic entity where correlations between the two are
unremarkable.The second feature requires the avoidance of using the Coulomb
gauge.Waves, tending to plane waves in the limit of zero diffraction,can then
be shown to be composed of two coupled sets of E and B fields that demonstrate
the classical entanglement of F and R waves.Being derived from Maxwells
equations,the theory is compatible with special relativity.This is used to
account for entanglement between waves traveling at arbitrary angles from a
source.In spite of a classical explanation,selection of appropriate F and R
waves means entanglement is likely to remain a quantum phenomenon.
