Is noise term needed in VUMPS as in iDMRG?

DMRG and Numerical Methods
1

Hello ITensor,

I have a question concerning VUMPS. It is well known that iDMRG might get stuck in a local minima, especially for cases where there are long-range interactions (e.g., when treating 2d systems as quasi-1d). One solution to that is to add noise terms that account for long-range interactions missing from projection to 2 sites, cf., PRB.72.180403. I wonder whether VUMPS is completely free from this issue.

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VUMPS can also get stuck, something like the noise term would probably be useful.

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