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Question about iTDVP

Posted: 09 Jun 2021, 19:43
by nsherman
I'm trying to implement the infinite TDVP algorithm based on these notes
https://arxiv.org/abs/1810.07006

It seems like these are the main steps:
1) Find the left and right environments
2) Use these to create effective Hamiltonians 0, and 1 site.
3) Integrate the TDVP equations to update the MPS tensors.

My question is, once I have update the MPS tensors, should I create a new left and right environment from these for further time evolution? Or can I just multiply this into the environments to update them? My intuition says I need to recreate the environment, but this seems quite expensive to have to do this for every time step, so I was wondering if there's a quicker way.