2009/11/12 by Giuseppe Vallone, Gaia Donati, Raino Ceccarelli +1 · 4 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1103/physreva.81.052301
published as Phys. Rev. A 81, 052301 (2010) · 11 pages, 10 figures, 4 Tables, RevTex4
arxiv created 2009/11/12 · openalex publication_date 2010/05/04 · arxiv updated 2010/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 |L͠C6\ensuremath⟩ 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.