Six-qubit two-photon hyperentangled cluster states: Characterization and application to quantum computation
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 productioDOI: 10.1103/PhysRevA.81.052301Citations: 26data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-02-23References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here