Mutual information on the fuzzy sphere
arXiv:1409.7069 · doi:10.1007/JHEP02(2015)063
Abstract
We numerically calculate entanglement entropy and mutual information for a massive free scalar field on commutative (ordinary) and noncommutative (fuzzy) spheres. We regularize the theory on the commutative geometry by discretizing the polar coordinate, whereas the theory on the noncommutative geometry naturally posseses a finite and adjustable number of degrees of freedom. Our results show that the UV-divergent part of the entanglement entropy on a fuzzy sphere does not follow an area law, while the entanglement entropy on a commutative sphere does. Nonetheless, we find that mutual information (which is UV-finite) is the same in both theories. This suggests that nonlocality at short distances does not affect quantum correlations over large distances in a free field theory.
16 pages, 10 figures. Fixed minor typos, references updated, discussion slightly expanded
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- Perturbative entanglement entropy in nonlocal theories
- Entanglement entropy on a fuzzy sphere with a UV cutoff
- Renormalized Entanglement Entropy on Cylinder
- Euclidean Time Approach to Entanglement Entropy on Lattices and Fuzzy Spaces