  We demonstrate that the phenomenon known as Spontaneous Parametric Down
Conversion is really an amplification, in a nonlinear crystal pumped by a
laser, of certain pairs of modes of the electromagnetic zeropoint field. The
demonstration is achieved by showing the existence of a related phenomenon,
Spontaneous Parametric Up Conversion. This phenomenon, once observed, will cast
doubt on the quantum-optical theory, which treats photons as the elementary
objects of the light field. It will also lend greater credibility to the
zeropoint-field description of optical entanglement phenomena. That description
is based on the unquantized light field and is consistently local, in contrast
with the nonlocal description of Quantum Optics.
