Optimal verification of entanglement in a photonic cluster state experiment

Year: 2011

Authors: Wunderlich H., Vallone G., Mataloni P., Plenio M.B.

Autors Affiliation: Univ Ulm, Inst Theoret Phys, D-89068 Ulm, Germany; Ctr Studi & Ric Enrico Fermi, I-00184 Rome, Italy; Univ Rome, Dipartimento Fis Sapienza, I-00185 Rome, Italy; Ist Nazl Ott INO CNR, I-50125 Florence, Italy.

Abstract: We report on the quantification of entanglement by means of entanglement measures on a four- and a six-qubit cluster state realized by using photons entangled both in polarization and linear momentum. This paper also addresses the question of the scaling of entanglement bounds from incomplete tomographic information on the density matrix under realistic experimental conditions.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 13      Pages from: 33033-1  to: 33033-10

More Information: We thank E Pomarico, R Ceccarelli and G Donati for their contribution to the measurements presented in [6, 7, 12, 30]. This work was supported by the EU Integrated Project Q-ESSENCE, the EU STREP project HIP and by an Alexander von Humboldt Professorship.
KeyWords: Cluster state; Density matrix; Entanglement measure; Experimental conditions; Linear momenta; Tomographic information
DOI: 10.1088/1367-2630/13/3/033033

Citations: 6
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