Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.100407
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Funding
- United Kingdom EPSRC
- Leverhulme Trust
- Future and Emerging Technologies (FET) [FP7-ICT-221906]
- Hamamatsu
- Engineering and Physical Sciences Research Council [EP/G011656/1, EP/G011567/1] Funding Source: researchfish
- EPSRC [EP/G011567/1, EP/G011656/1] Funding Source: UKRI
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Optical vortices are lines of phase singularity which percolate through all optical fields. We report the entanglement of linked optical vortex loops in the light produced by spontaneous parametric down-conversion. As measured by using a Bell inequality, this entanglement between topological features extends over macroscopic and finite volumes. The entanglement of photons in complex three-dimensional topological states suggests the possibility of entanglement of similar features in other quantum systems describable by complex scalar functions, such as superconductors, superfluids, and Bose-Einstein condensates.
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