Hi,
The spectrum of the reduced density matrix has been discussed previously in the mailing list. You find more info and some example code at: https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/2015/002677.html
Best regards, Michele
-- ETH Zurich Michele Dolfi Institute for Theoretical Physics HIT G 32.4 Wolfgang-Pauli-Str. 27 8093 Zurich Switzerland
dolfim@phys.ethz.ch www.itp.phys.ethz.ch
+41 44 633 78 56 phone +41 44 633 11 15 fax
On 15 Sep 2016, at 09:29, Robertson Esperanza robbie.esperanza@gmail.com wrote:
Hello,
Thank you for replying to my previous inquiries. For now, I'm looking at the von neumann entropy of some variation of the Hubbard Hamiltonian, and I'm using the mps_optim application. Since the von Neumann entropy can be calculated, will I be able to access the eigenvalues of the reduced density matrices? If yes, how can I do that?
I would like to also do the same thing using the exact diagonalization, but there is no function, as far as I know, to calculate the non Neumann entropy. How can I access the eigenvalued of the reduced density matrices using the ALPS application for exact diagonalization?
Regards, Robbie
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