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Phys Rev Lett. 2005 Nov 18;95(21):210504. Epub 2005 Nov 18.

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

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Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia.


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.

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