def _to_matrix(pauli, phase, sparse=False):
""""Return the Pauli stabilizer matrix from symplectic representation.
Args:
pauli (array): symplectic Pauli vector.
phase (bool): the phase value for the Pauli.
sparse (bool): if True return a sparse CSR matrix, otherwise
return a dense Numpy array (Default: False).
Returns:
array: if sparse=False.
csr_matrix: if sparse=True.
"""
# pylint: disable=arguments-differ
mat = PauliTable._to_matrix(pauli, sparse=sparse, real_valued=True)
if phase:
mat *= -1
return mat
def __getitem__(self, key):
sumopcoeff = self.obj.coeff * self.obj.primitive.coeffs[key]
mat = PauliTable._to_matrix(
self.obj.primitive.table.array[key], sparse=sparse)
return sumopcoeff * mat
def __getitem__(self, key):
coeff = self.obj.coeffs[key]
mat = PauliTable._to_matrix(self.obj.table.array[key],
sparse=sparse)
return coeff * mat
