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Science. 2009 Jan 23;323(5913):483-5. doi: 10.1126/science.1167182.

An entanglement filter.

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  • 1Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan.

Abstract

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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PMID:
19164743
[PubMed]
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