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MPO tensors #144

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11 changes: 11 additions & 0 deletions cyten/models/degrees_of_freedom.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
SymmetryError,
U1Symmetry,
ZNSymmetry,
Sector
)
from ..tensors import DiagonalTensor, SymmetricTensor
from ..tools import as_immutable_array, is_iterable, to_iterable, to_valid_idx
Expand Down Expand Up @@ -149,6 +150,16 @@ def add_onsite_operator(
)
self.onsite_operators[name] = op

@abstractmethod
def get_mpo_building_block(self, label: str) -> SymmetricTensor:
"""FIXME"""
...

@abstractmethod
def mpo_building_block_basis(self, a: Sector, b: Sector) -> list[int]:
""""""
...

def state_index(self, label: str | int) -> int:
"""The index of a basis state."""
if isinstance(label, str):
Expand Down
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