An entanglement filter

Ryo Okamoto, Jeremy L. O'Brien, Holger F. Hofmann, Tomohisa Nagata, Keiji Sasaki, Shigeki Takeuchi

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)483-485
Number of pages3
Issue number5913
Publication statusPublished - 23 Jan 2009
Externally publishedYes


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