The simplest demonstrations of quantum nonlocality

Saunders, Dylan J. and Palsson, Matthew S. and Pryde, Geoff J. and Scott, Andrew J. and Barnett, Stephen M. and Wiseman, Howard M. (2012) The simplest demonstrations of quantum nonlocality. New Journal of Physics, 14. 113020. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/14/11/113020)

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Abstract

We investigate the complexity cost of demonstrating the key types of nonclassical correlations-Bell inequality violation, Einstein, Podolsky, Rosen (EPR)-steering, and entanglement-with independent agents, theoretically and in a photonic experiment. We show that the complexity cost exhibits a hierarchy among these three tasks, mirroring the recently discovered hierarchy for how robust they are to noise. For Bell inequality violations, the simplest test is the well-known Clauser-Horne-Shimony-Holt test, but for EPR-steering and entanglement the tests that involve the fewest number of detection patterns require nonprojective measurements. The simplest EPR-steering test requires a choice of projective measurement for one agent and a single nonprojective measurement for the other, while the simplest entanglement test uses just a single nonprojective measurement for each agent. In both of these cases, we derive our inequalities using the concept of circular two-designs. This leads to the interesting feature that in our photonic demonstrations, the correlation of interest is independent of the angle between the linear polarizers used by the two parties, which thus require no alignment.

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• Item metadata

  Item type:	Article
  ID code:	42536
  Dates:	Date Event 15 November 2012 Published
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics
  Depositing user:	Pure Administrator
  Date deposited:	15 Jan 2013 08:42
  Last modified:	12 Dec 2024 02:45
  Related URLs:	Scopus publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/42536