  There is a very common fallacy, here called the separation fallacy, that is
involved in the interpretation of quantum experiments involving a certain type
of separation such as the: double-slit experiments, which-way interferometer
experiments, polarization analyzer experiments, Stern-Gerlach experiments, and
quantum eraser experiments. It is the separation fallacy that leads not only to
flawed textbook accounts of these experiments but to flawed inferences about
retrocausality in the context of "delayed choice" versions of separation
experiments.
