Abstract

Most investigations of multipartite entanglement have been concerned with temporal modes of the electromagnetic field and have neglected its spatial structure. We present a simple model which allows us to generate tripartite entanglement between spatial modes by parametric down-conversion with two symmetrically tilted plane waves serving as a pump. The characteristics of this entanglement are investigated. We also discuss the generalization of our scheme to $2N+1$ partite entanglement using $2N$ symmetrically tilted plane pump waves. Another interesting feature is the possibility of entanglement localization in just two spatial modes.

© 2010 Optical Society of America

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