How Einstein and/or Schrödinger should have discovered Bell's theorem in 1936
Abstract
We show how one can be led from considerations of quantum steering to Bell's theorem. We begin with Einstein's demonstration that, assuming local realism, quantum states must be in a many-to-one ("incomplete") relationship with the real physical states of the system. We then consider some simple constraints that local realism imposes on any such incomplete model of physical reality, and show they are not satisfiable. In particular, we present a very simple demonstration for the absence of a local hidden variable incomplete description of nature by steering to two ensembles, one of which contains a pair of non-orthogonal states. Historically this is not how Bell's theorem arose - there are slight and subtle differences in the arguments - but it could have been.
- Publication:
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Journal of the Optical Society of America B Optical Physics
- Pub Date:
- April 2015
- DOI:
- 10.1364/JOSAB.32.000A50
- arXiv:
- arXiv:1411.4387
- Bibcode:
- 2015JOSAB..32A..50J
- Keywords:
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- Quantum Physics
- E-Print:
- Minor changes to v1, new footnote [8] and reference [19] added