Wednesday, March 20, 2013

1303.4209 (Fabio Deelan Cunden et al.)

Typical Entanglement    [PDF]

Fabio Deelan Cunden, Paolo Facchi, Giuseppe Florio, Saverio Pascazio
Let a pure state \psi be chosen randomly in an NM-dimensional Hilbert space, and consider the reduced density matrix \rho of an N-dimensional subsystem. The bipartite entanglement properties of \psi are encoded in the spectrum of \rho. By means of a saddle point method and using a "Coulomb gas" model for the eigenvalues, we obtain the typical spectrum of reduced density matrices. We consider the cases of an unbiased ensemble of pure states and of a fixed value of the purity. We finally obtain the eigenvalue distribution by using a statistical mechanics approach based on the introduction of a partition function.
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