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Phys. Rev. Lett. 101, 050403 (2008) [4 pages]

Hidden Variable Models for Quantum Theory Cannot Have Any Local Part

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Roger Colbeck1,2,* and Renato Renner1,†
1Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland.
2Institute of Theoretical Computer Science, ETH Zurich, 8092 Zurich, Switzerland.

Received 23 February 2008; published 1 August 2008

See accompanying Physics Synopsis

It was shown by Bell that no local hidden variable model is compatible with quantum mechanics. If, instead, one permits the hidden variables to be entirely nonlocal, then any quantum mechanical predictions can be recovered. In this Letter, we consider general hidden variable models which can have both local and nonlocal parts. We show the existence of (experimentally verifiable) quantum correlations that are incompatible with any hidden variable model having a nontrivial local part, such as the model proposed by Leggett.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.050403
DOI:
10.1103/PhysRevLett.101.050403
PACS:
03.65.Ud, 03.65.Ta, 03.67.Mn

*colbeck@phys.ethz.ch

renner@phys.ethz.ch