Continuation Charge Sector Projection #363 #398
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…MPS into MPS class In the classmethod from_infiniteT_canonical of PurificationMPS the first step corresponds to finding a tree of possible charges at each site which corresponds to the desired charge sector. This logic is moved into the MPS class as it will be used to project a product state onto a desired charge sector. The classmethod from_infiniteT_canonical is adapted.
… MPS This is similar to the method from_infiniteT_canonical of the PurificationMPS class. In the canonical ensemble each local basis state has the same probability in a charge sector. For the new classmethod project_onto_charge_sector it is possible to pass a list of coefficients for each local basis state for each site in the desired charge sector. This effectively projects a product state onto a desired charge sector.
and remove unnecessary sorting in `get_charge_tree_for_given_charge_sector`
Simplify initialization of sites and add comments to the test. Furthermore include a test for conservation of ``'N'`` for `FermionSite`
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I think Ludwig and Philipp are already addressing this, but just as a reminder here: PurificationMPS.from_infiniteT_canonical doesn't work with two independent charges, as also pointed out in this forum thread |
This fixes the method `project_onto_charge_sector` in mps.py. A charge tree can now be generated for more than 1 type of charge. Update test_cs_projection.py accordingly and include a test for `PurificationMPS.from_infiniteT_canonical`. Add some comments to better understand how the "tree" is constructed.
Add cs-projection to changelog
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I just updated the method |
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This is a continuation of #363 (due to renaming of the repo/branch)
Closes #363