An Entanglement Filter

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Science  23 Jan 2009:
Vol. 323, Issue 5913, pp. 483-485
DOI: 10.1126/science.1167182

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The ability to filter quantum states is a key capability in quantum information science and technology, in which one-qubit filters, or polarizers, have found wide application. Filtering on the basis of entanglement requires extension to multi-qubit filters with qubit-qubit interactions. We demonstrated an optical entanglement filter that passes a pair of photons if they have the desired correlations of their polarization. Such devices have many important applications to quantum technologies.

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