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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