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2014

Mutual information on the fuzzy sphere

Sabella-Garnier, Philippe

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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.

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D. Dou and B. Ydri, Entanglement entropy on fuzzy spaces
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