Experimental Violation of Bell's Inequality in Spatial-Parity Space
Abstract
We report the first experimental violation of Bell’s inequality in the spatial domain using the Einstein-Podolsky-Rosen state. Two-photon states generated via optical spontaneous parametric down-conversion are shown to be entangled in the parity of their one-dimensional transverse spatial profile. Superpositions of Bell states are prepared by manipulation of the optical pump’s transverse spatial parity—a classical parameter. The Bell-operator measurements are made possible by devising simple optical arrangements that perform rotations in the one-dimensional spatial-parity space of each photon of an entangled pair and projective measurements onto a basis of even-odd functions. A Bell-operator value of 2.389±0.016 is recorded, a violation of the inequality by more than 24 standard deviations.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2007
- DOI:
- 10.1103/PhysRevLett.99.170408
- arXiv:
- arXiv:0708.0653
- Bibcode:
- 2007PhRvL..99q0408Y
- Keywords:
-
- 03.65.Ud;
- 03.67.Mn;
- 42.65.Lm;
- Entanglement and quantum nonlocality;
- Entanglement production characterization and manipulation;
- Parametric down conversion and production of entangled photons;
- Quantum Physics
- E-Print:
- 10 pages, 3 figures, 1 Table