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Phys. Rev. A 66, 064301 (2002) [4 pages]

Polarization-entangled W state using parametric down-conversion

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Takashi Yamamoto *, Kiyoshi Tamaki, Masato Koashi, and Nobuyuki Imoto †
CREST Research Team for Interacting Carrier Electronics, School of Advanced Sciences, The Graduate University for Advanced Studies (SOKENDAI), Hayama, Kanagawa 240-0193, Japan

Received 27 August 2002; published 6 December 2002

An experimental scheme for preparing a polarization entangled W states from four photons emitted by parametric down-conversion is proposed. We consider two different configurations and a method of improving the yield by using single-photon sources. In the proposed scheme, one uses only linear optical elements and photon detectors, so that this scheme is feasible by current technologies.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.66.064301
DOI: 10.1103/PhysRevA.66.064301
PACS: 03.67.-a, 42.50.-p

* Electronic address: yamamoto@koryuw01.soken.ac.jp
† URL: http://www.soken.ac.jp/quantum/index.html

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