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Phys Rev Lett. 2005 Dec 9;95(24):240501. Epub 2005 Dec 8.

Experimental demonstration of fractional orbital angular momentum entanglement of two photons.

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  • 1Huygens Laboratory, Leiden University, Post Office Box 9504, 2300 RA Leiden, The Netherlands.


The singular nature of a noninteger spiral phase plate allows easy manipulation of spatial degrees of freedom of photon states. Using two such devices, we have observed very high-dimensional spatial entanglement of twin photons generated by spontaneous parametric down-conversion.

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