Scientific Results

Complete analysis of measurement-induced entanglement localization on a three-photon system

Year: 2010

Authors: Gavenda M., Filip R., Nagali E., Sciarrino F., De Martini F.

Autors Affiliation: Department of Optics, Palack´y University, 17. listopadu 12, CZ-77146 Olomouc, Czech Republic; Dipartimento di Fisica, Sapienza Università di Roma, piazzale Aldo Moro 5, I-00185 Roma, Italy; Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, I-50125 Firenze, Italy; Academia Nazionale dei Lincei, Via della Lungara 10, I-00165 Roma, Italy

Abstract: We discuss both theoretically and experimentally elementary two-photon polarization entanglement localization after break of entanglement caused by linear coupling of environmental photon with one of the system photons. The localization of entanglement is based on simple polarization measurement of the surrounding photon after the coupling. We demonstrate that nonzero entanglement can be localized back irrespectively to the distinguishability of coupled photons. Further, it can be increased by local single-copy polarization filters up to an amount violating Bell inequalities. The present technique allows restoration of entanglement in those cases, when the entanglement distillation produces no entanglement from the coupling.

Journal/Review: PHYSICAL REVIEW A

Volume: 81 (2)      Pages from: 022313  to: 022313

More Information: The research has been supported by project no. MSM 6198959213 and no. LC06007 of the Czech Ministry of Education. R. F. acknowledges Grant 202/07/J040 of GA CR and support by the Alexander von Humboldt Foundation.
KeyWords: quantum state; noisy entanglement; states; teleportation; purification
DOI: 10.1103/PhysRevA.81.022313

Citations: 3
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