TITLE

Experimental four-qubit bound entanglement

AUTHOR(S)
Amselem, Elias; Bourennane, Mohamed
PUB. DATE
October 2009
SOURCE
Nature Physics;Oct2009, Vol. 5 Issue 10, p748
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Entanglement is one of the most puzzling features of quantum theory and of great importance for the new field of quantum information. Being a peculiar form of entanglement, bound entanglement emerges in certain mixed quantum states. This form of entanglement is not distillable by local operators and classical communication. Bound-entangled states are different from both the free entangled (distillable) and separable states. Here we report on the first experimental demonstration of a four-qubit polarization bound-entangled state, the so-called Smolin state. We have fully characterized its entanglement properties. Moreover, we have realized unlocking of the entanglement protocol for this state. The special properties of the Smolin state constitute a useful quantum resource for new multiparty communication schemes.
ACCESSION #
44414821

 

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