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High-efficiency cluster-state generation with atomic ensembles via the dipole-blockade mechanism

Zwierz, M. and Kok, P. (2009) High-efficiency cluster-state generation with atomic ensembles via the dipole-blockade mechanism. Physical Review A, 79 (2). Art. No.022304. ISSN 1050-2947

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Abstract

We demonstrate theoretically a scheme for cluster-state generation, based on atomic ensembles and the dipole-blockade mechanism. In the protocol, atomic ensembles serve as single-qubit systems. Therefore, we review single-qubit operations on qubit defined as collective states of atomic ensemble. Our entangling protocol requires nearly identical single-photon sources, one ultracold ensemble per physical qubit, and regular photodetectors. The general entangling procedure is presented, as well as a procedure that generates in a single step Q-qubit GHZ states with success probability p(success) similar to eta(Q/2), where eta is the combined detection and source efficiency. This is significantly more efficient than any known robust probabilistic entangling operation. GHZ states form the basic building block for universal cluster states, a resource for the one-way quantum computer.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Physical Society. This is an author produced version of a paper subsequently published in Physical Review A. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 29 Jun 2009 14:59
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1103/PhysRevA.79.022304
Status: Published
Publisher: American Physical Society
Refereed: Yes
Identification Number: 10.1103/PhysRevA.79.022304
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/8732

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