Scientific Results

Tomographic characterization of correlations in a photonic tripartite state

Year: 2012

Authors: Chiuri A., Mazzola L., Paternostro M., Mataloni P.

Autors Affiliation: Dipartimento di Fisica, Sapienza Universita di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy; Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK; Institut fur Theoretische Physik, Albert-Einstein-Allee 11, Universitat Ulm, D-89069 Ulm, Germany; Istituto Nazionale di Ottica (INO-CNR), Largo E Fermi 6, I-50125 Firenze, Italy

Abstract: Starting from a four-partite photonic hyper-entangled Dicke resource, we report the full tomographic characterization of three-, two- and one-qubit states obtained by projecting out part of the computational register. The reduced states thus obtained correspond to fidelities with the expected states larger than 87%, therefore certifying the faithfulness of the entanglement-sharing structure within the original four-qubit resource. The high quality of the reduced three-qubit state allows for the experimental verification of the Koashi-Winter relation for the monogamy of correlations within a tripartite state. We show that, by exploiting the symmetries of the three-qubit state obtained upon projection over the four-qubit Dicke resource, such a relation can be experimentally fully characterized using only five measurement settings. We highlight the limitations of such an approach and sketch an experimentally oriented way of overcoming them.

Journal/Review: NEW JOURNAL OF PHYSICS

Volume: 14      Pages from: 085006  to: 085006

More Information: This work was supported by the EU Project CHISTERA-QUASAR, PRIN 2009 and FIRB-Futuro in ricerca HYTEQ, the EU under a Marie Curie IEF Fellowship, the Alexander von Humboldt Stiftung, and the UK EPSRC under a Career Acceleration Fellowship and a grant from the \’New Directions for Research Leaders\’ initiative (EP/G004579/1)
KeyWords: experimental realization; quantum teleportation; entanglement; qubits; game
DOI: 10.1088/1367-2630/14/8/085006

Citations: 4
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English