It seems IQtensor only supports U(1) symmetry group, but what about finite groups, like Z_{q}?

Or doest it respect parity symmetry and or a combination of them? like U(1)*Z_{q}*Z_{2}.

Please let me know of any documentation.

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Good question: yes since ITensor version 2.0 we have a fairly general quantum number system that can handle U(1) and Z_q type Abelian quantum numbers. The system can handle combinations as well: each QN object is an ordered collection of the various conserved quantum numbers.

Here is the documentation: http://itensor.org/docs.cgi?page=classes/qn

Let me know if you have any more specific questions about it.

Miles

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