Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 23 January 2009:
Vol. 323. no. 5913, pp. 483 - 485
DOI: 10.1126/science.1167182
Prev | Table of Contents | Next

Reports

An Entanglement Filter

Ryo Okamoto,1,2* Jeremy L. O'Brien,3* Holger F. Hofmann,4 Tomohisa Nagata,1,2 Keiji Sasaki,1 Shigeki Takeuchi1,2{dagger}

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.

1 Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan.
2 The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan.
3 Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK.
4 Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: takeuchi{at}es.hokudai.ac.jp

Read the Full Text

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)