An Entanglement Filter

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

An Entanglement Filter

Authors

Description

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.
4 pages, 3 figures