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 partite entanglement using 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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