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Journal of Modern Optics

Heralded multiphoton GHZ-type polarization entanglement generation from parametric down-conversion sources

Xiao-Ling Niu, Yan-Xiao Gong, Xu‐Bo Zou, Yun‐Feng Huang, Guang‐Can Guo

Published Mar 31, 2009• 8 citations
Publisher

Abstract

We propose a scheme to generate an N-photon GHZ-type polarization-entangled state from 2N − 1 parametric down-conversion sources, by using only linear optical elements and projective measurements. Successful preparation is heralded by detecting 3N − 2 photons with ideal number-resolving photon detectors.
DOI
10.1080/09500340902822341

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We propose two interesting methods of generating the four-photon WWW state. These methods use parametric down-conversion processes, linear optical elements, and commercial photon detectors, which are readily feasible under current technology. They can also be used to generate the three-photon WWW state, the three-photon Greenberger-Horne-Zeilinger state, and the three-photon maximally entangled photon-number state (a typical photon-number entanglement state) by simply changing some experimental components or their parameters. Moreover, assuming we have photon number-resolving detectors, these methods can develop into methods that generate a general nnn-photon WWW state. They are expected to become powerful tools for experimental investigations of multipartite entanglement and its applications to quantum information processing.
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