A holographic proof of the strong subadditivity of entanglement entropy

Abstract

When a quantum system is divided into subsystems, their entanglement entropies are subject to an inequality known as "strong subadditivity". For a field theory this inequality can be stated as follows: given any two regions of space $A$ and $B$, $S(A)+S(B)\ge S(A\cup B)+S(A\cap B)$. Recently, a method has been found for computing entanglement entropies in any field theory for which there is a holographically dual gravity theory. In this note we give a simple geometrical proof of strong subadditivity employing this holographic prescription.

arXiv comment9 pages, 3 figures

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