Free fermions violate the area law for e
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R.C. Helling; W. Spitzer
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Article
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2010
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John Wiley and Sons
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English
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## Abstract We show that the entanglement entropy associated to a region grows faster than the area of its boundary surface. This is done by proving a special case of a conjecture due to Widom that yields a surprisingly simple expression for the leading behaviour of the entanglement entropy.