Role of Particle Entanglement in the Violation of Bell Inequalities
Authors: Wasak T., Smerzi A., Chwedenczuk J.
Autors Affiliation: [Wasak, Tomasz; Chwedenczuk, Jan] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland.
[Smerzi, Augusto] CNR, INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy and LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy.
Abstract: Entanglement between two separate systems is a necessary resource to violate a Bell inequality in a test of local realism. We demonstrate that to overcome the Bell bound, this correlation must be accompanied by the entanglement between the constituent particles. This happens whenever a super-selection rule prohibits coherences between states with different total number of particles and thus imposes a constraint on feasible local operations in each sub-system. We show that the necessary entanglement between the particles might solely result from their indistinguishability. We also give an example of both mode and particle-entangled pure state, which does not violate any Bell inequality. Our result reveals a fundamental relation between the non-locality and the particle entanglement.
Journal/Review: SCIENTIFIC REPORTS
Volume: 8 Pages from: 1777-1 to: 1777-6
KeyWords: hidden-variable theories; quantum nonlocality; photons; states; DOI: 10.1038/s41598-018-20034-8Citations: 3data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-02-28References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here