An entanglement filter.
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.
Okamoto
Ryo
R
Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan.
O'Brien
Jeremy L
JL
Hofmann
Holger F
HF
Nagata
Tomohisa
T
Sasaki
Keiji
K
Takeuchi
Shigeki
S