Dear ALPS user

I want to calculate the left reduced density matrix

\rho_L=Tr_R |\Phi><\Phi|

using DMRG and then evaluate the entanglement spectrum consists of the energies of the entanglement Hamiltonian
H_E=-Ln(\rho_L)

But we don't have direct access to the many body wave function in the DMRG calculations using ALPS.

Is there any way to evaluate these parameters in the DMRG calculations using ALPS?

Thanks

H. Mosadeq
Shahr-e-Kord University (SKU),
Shahr-e-Kord , Iran