We holographically measure entangled tangles of phase singularity lines in light generated via spontaneous parametric down-conversion. This type of entanglement is interesting because it is between topological features that extend over finite, macroscopic, isolated volumes.
(050.0050) Diffraction and gratings : Diffraction and gratings
(270.0270) Quantum optics : Quantum optics
(050.4865) Diffraction and gratings : Optical vortices
(270.5585) Quantum optics : Quantum information and processing
M. J. Romero, J. Leach, B. Jack, M. R. Dennis, S. Franke-Arnold, S. Barnett, and M. J. Padgett, "Entangled Tangles of Phase Singularities," in Frontiers in Optics 2010/Laser Science XXVI, OSA Technical Digest (CD) (Optical Society of America, 2010), paper FTuG5.
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