Experimental Violation of Local Realism by Four-Photon Greenberger-Horne-Zeilinger Entanglement
Abstract
We report the first experimental violation of local realism by four-photon Greenberger-Horne-Zeilinger (GHZ) entanglement. In the experiment, the nonstatistical GHZ conflicts between quantum mechanics and local realism are confirmed, within the experimental accuracy, by four specific measurements of polarization correlations between four photons. In addition, our experimental results also demonstrate a strong violation of Mermin-Ardehali-Belinskii-Klyshko inequality by 76 standard deviations. Such a violation can only be attributed to genuine four-photon entanglement.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2003
- DOI:
- arXiv:
- arXiv:quant-ph/0302137
- Bibcode:
- 2003PhRvL..91r0401Z
- Keywords:
-
- 03.65.Ud;
- 03.67.Mn;
- 42.50.Dv;
- 42.50.Xa;
- Entanglement and quantum nonlocality;
- Entanglement production characterization and manipulation;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Optical tests of quantum theory;
- Quantum Physics
- E-Print:
- 4 pages, 4 figures, Submitted