Scientific Results

Six-qubit two-photon hyperentangled cluster states: Characterization and application to quantum computation

Year: 2010

Authors: Vallone G., Donati G., Ceccarelli R., Mataloni P.

Autors Affiliation: Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89/A, Compendio del Viminale, Roma I-00184, Italy; Dipartimento di Fisica, Università Sapienza di Roma, Roma I-00185, Italy; Istituto Nazionale di Ottica (INO-CNR), L.go E. Fermi 6, I-50125 Florence, Italy

Abstract: Six-qubit cluster states built on the simultaneous entanglement of two photons in three independent degrees of freedom, that is, polarization and a double longitudinal momentum, have been recently demonstrated. We present here the peculiar entanglement properties of the linear cluster state (vertical bar LC(6)>) over tilde related to the three degrees of freedom. This state has been adopted to realize various kinds of controlled NOT (CNOT) gates, obtaining high values of the fidelity of the expected output states for all considered cases. Our results demonstrate that these states may represent a promising approach toward scalable quantum computation in a medium-term time scale. The future perspectives of a hybrid approach to one-way quantum computing based on multiple degrees of freedom and multiphoton cluster states are also discussed in the conclusion of this article.

Journal/Review: PHYSICAL REVIEW A

Volume: 81 (5)      Pages from: 052301  to: 052301

KeyWords: Parametric down conversion and productio
DOI: 10.1103/PhysRevA.81.052301

Citations: 26
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English