To the Extent there is Entanglement, there is no Measurement

Summary

Modern quantum theory derives from two disparate processes: the Born probability postulate and Schrodinger’s equation that were later formalized by von Neumann.  Von Neumann’s Process 1 postulate provides a probabilistic non-unitary reduction to be applied when a quantum system interacts with a measurement device and otherwise Schrodinger’s equation is specified via Postulate 2. Schrodinger showed in 1935 that the use of his equation to describe interactions leads to macroscopic objects existing in an entangled superposition. The question of whether or not entanglement can co-exist with the physics of measurement is examined herein.  Two entangled photons are considered that each interacts with macroscopic detectors. It is shown that E+M<1 for which the entanglement is quantified as E and measurement as M. Measurement is assumed to occur on the two degrees of freedom composing the entanglement. In this sense, it is shown that to the extent there is entanglement, there is no measurement