qiskit.opflow.double_commutator

double_commutator(op_a, op_b, op_c, sign=False)

Compute symmetric double commutator of op_a, op_b and op_c. See McWeeny chapter 13.6 Equation of motion methods (page 479)

If sign is False, it returns

If sign is True, it returns

Parameters

• op_a (OperatorBase) – Operator A
• op_b (OperatorBase) – Operator B
• op_c (OperatorBase) – Operator C
• sign (bool) – False anti-commutes, True commutes

Returns

the double commutator

Return type

OperatorBase