optimize SparsePauliOp.tensor (#9621)

Co-authored-by: Ikko Hamamura <ikkoham@users.noreply.github.com>
Qiskit · Feb 21, 2023 · e2d31ff · e2d31ff
1 parent 4e3b283
commit e2d31ff
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/qiskit/quantum_info/operators/symplectic/sparse_pauli_op.py b/qiskit/quantum_info/operators/symplectic/sparse_pauli_op.py
@@ -335,7 +335,7 @@ def expand(self, other):
     def _tensor(cls, a, b):
         paulis = a.paulis.tensor(b.paulis)
         coeffs = np.kron(a.coeffs, b.coeffs)
-        return SparsePauliOp(paulis, coeffs, copy=False)
+        return SparsePauliOp(paulis, coeffs, ignore_pauli_phase=True, copy=False)
 
     def _add(self, other, qargs=None):
         if qargs is None: