Demonstration of a simple entangling optical gate and its use in bell-state analysis

We demonstrate a new architecture for an optical entangling gate that is significantly simpler than previous realizations, using partially polarizing beam splitters so that only a single optical mode-matching condition is required. We demonstrate operation of a controlled-z gate in both continuous-w...

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Bibliographic Details
Published in:Physical review letters 2005-11, Vol.95 (21), p.210504.1-210504.4, Article 210504
Main Authors: LANGFORD, N. K, WEINHOLD, T. J, PREVEDEL, R, RESCH, K. J, GILCHRIST, A, O'BRIEN, J. L, PRYDE, G. J, WHITE, A. G
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary:We demonstrate a new architecture for an optical entangling gate that is significantly simpler than previous realizations, using partially polarizing beam splitters so that only a single optical mode-matching condition is required. We demonstrate operation of a controlled-z gate in both continuous-wave and pulsed regimes of operation, fully characterizing it in each case using quantum process tomography. We also demonstrate a fully resolving, nondeterministic optical Bell-state analyzer based on this controlled-z gate. This new architecture is ideally suited to guided optics implementations of optical gates.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.95.210504