## Abstract

We present an experimental test of the Clauser-Horne-Shimony-Holt Bell inequality on photon pairs in a

maximally entangled state of polarization in which a value S = 2.82759 ± 0.00051 is observed. This value comes close to the Tsirelson bound of |S|≤ 2 Sqrt(2), with S −2 Sqrt(2) =0.00084 ± 0.00051. It also violates

the bound |S| ≤ 2.82537 introduced by Grinbaum by 4.3 standard deviations. This violation allows us to exclude that quantum mechanics is only an effective description of a more fundamental theory.

maximally entangled state of polarization in which a value S = 2.82759 ± 0.00051 is observed. This value comes close to the Tsirelson bound of |S|≤ 2 Sqrt(2), with S −2 Sqrt(2) =0.00084 ± 0.00051. It also violates

the bound |S| ≤ 2.82537 introduced by Grinbaum by 4.3 standard deviations. This violation allows us to exclude that quantum mechanics is only an effective description of a more fundamental theory.

Original language | English |
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Article number | 180408 |

Number of pages | 4 |

Journal | Physical Review Letters |

Volume | 115 |

Issue number | 18 |

DOIs | |

Publication status | Published - 30 Oct 2015 |

## Structured keywords

- Photonics and Quantum