Demonstration of a simple entangling optical gate and its use in Bell-state analysis
arXiv:quant-ph/0506262 · doi:10.1103/PhysRevLett.95.210504
Abstract
We demonstrate a new architecture for an optical entangling gate that is significantly simpler than previous realisations, using partially-polarising beamsplitters 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 characterising it in each case using quantum process tomography. We also demonstrate a fully-resolving, nondeterministic optical Bell-state analyser based on this controlled-Z gate. This new architecture is ideally suited to guided optics implementations of optical gates.
4 pages, 3 figures. v2: additional author, improved data and figures (low res), some other minor changes. Accepted for publication in PRL
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