## wave function from MPS

Discussing the best way to implement feature X
joanafrx
Posts: 1
Joined: 07 Jan 2020, 15:20

### wave function from MPS

Hello,

I would like to obtain the wave function coefficients from an MPS for a system where I conserve the U(1) symmetry. In principle, I would use:

Code: Select all

wf = psi.get_theta(0,L).to_ndarray().reshape(-1)[
where L is the length of the system, but I am not sure if this is correct.
Will the order of the coefficients change depending on the region of the phase diagram that I am studying?

Thank you

Joana
Johannes
Site Admin
Posts: 357
Joined: 21 Jul 2018, 12:52
Location: TU Munich

### Re: wave function from MPS

They will only depend on the charge conservation you're using.

I guess you're aware of this, but just to be clear: when you do this, you write down all 2^L states, so you could just as well use exact diagonalization....