  Quantum Electrodynamics may be formulated as a Quantum Field Theory , and
also as relativistic quantum mechanics by introduction of the
Feynman-Stueckelberg parameter. As stated by M. Srednicki ({\it Quantum Field
Theory}, Cambridge University Press, Cambridge and New York, 2007), "\dots any
relativistic quantum physics that can be treated in one formalism can also be
treated in the other". Entanglement of electrons at macroscopic spacelike
separation has been observed (B. Hensen {\it et al.}, Nature, $\bf{526}$, 2015,
doi:10.1038.nature/15759), yet according to Quantum Field Theory is restricted
to separations of the order of the Compton wavelength $\hbar/m_e c$ (see e.g.,
S. J. Summers and R. Werner, Commun. Math. Phys. $\bf{110}$,247,1987). There is
no restriction on entanglement in parametrized relativistic quantum mechanics
(A. F. Bennett, Ann. Phys. $\bf{345}$, 1, 2014). The parametrized formalism is
extended here to pair annihilation and pair creation. The {\it ansatz} used in
the formalism to develop the correct higher order corrections is justified here
with plane wave summations. The conflict over entanglement is further discussed
in terms of the Klein-Gordon propagator, and an invariant Bell's inequality is
developed for spin -1/2.
