Experimental Quantum Computing without Entanglement

Lanyon, B. P., Barbieri, M., Almeida, M. P. and White, A. G. (2008) Experimental Quantum Computing without Entanglement. Physical Review Letters, 101 20: 200501-1-200501-4. doi:10.1103/PhysRevLett.101.200501

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Author Lanyon, B. P.
Barbieri, M.
Almeida, M. P.
White, A. G.
Title Experimental Quantum Computing without Entanglement
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2008-11-13
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.101.200501
Open Access Status File (Publisher version)
Volume 101
Issue 20
Start page 200501-1
End page 200501-4
Total pages 4
Editor G. Basbas
J. Sandweiss
R. B. Schuhmann
S. G. Brown
Place of publication College Park, Md.,
Publisher American Physical Society
Collection year 2009
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
020603 Quantum Information, Computation and Communication
Abstract Deterministic quantum computation with one pure qubit (DQC1) is an efficient model of computation that uses highly mixed states. Unlike pure-state models, its power is not derived from the generation of a large amount of entanglement. Instead it has been proposed that other nonclassical correlations are responsible for the computational speedup, and that these can be captured by the quantum discord. In this Letter we implement DQC1 in an all-optical architecture, and experimentally observe the generated correlations. We find no entanglement, but large amounts of quantum discord—except in three cases where an efficient classical simulation is always possible. Our results show that even fully separable, highly mixed, states can contain intrinsically quantum mechanical correlations and that these could offer a valuable resource for quantum information technologies.
Keyword Single-photon
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 517 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 487 times in Scopus Article | Citations
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Created: Tue, 17 Mar 2009, 13:57:02 EST by Jo Hughes on behalf of School of Mathematics & Physics