# Product states, entanglement, and measurement.

@article{Hobson2019ProductSE, title={Product states, entanglement, and measurement.}, author={Art Hobson}, journal={arXiv: Quantum Physics}, year={2019} }

A product state of a composite quantum system AB is customarily interpreted physically to mean subsystem A has property A1 and subsystem B has property B1. But this interpretation contradicts both the theory and observed outcomes of non-local interferometry experiments on the momentum-entangled state of two photons. These experiments demonstrate that product states must be interpreted physically as correlations, i.e. the product state means A has property A1 if and only if B has property B1…

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