O'Rourke–Wei central limit conjecture for von Neumann entropy

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Let mm and nn be the dimensions of the two subsystems, let c=m/nc=m/n, and let XX be the standardized von Neumann entropy. Consider the fixed-trace ensemble of reduced density matrices. O'Rourke–Wei conjecture. In the limit

m,n,mn=c(0,1],m\to\infty,\qquad n\to\infty,\qquad \frac{m}{n}=c\in(0,1],

the standardized von Neumann entropy XX converges in distribution to a Gaussian random variable with zero mean and unit variance. This is a central limit conjecture motivated by numerical evidence and by central limit behavior for linear spectral statistics over random matrix ensembles; the supplied text does not state a resolution.

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Primary source

Lu Wei, “Skewness of von Neumann entanglement entropy”, arXiv:1910.01199 (2019).

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