qiskit.opflow.double_commutator

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

Deprecated: 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

[[A, B], C]/2 + [A, [B, C]]/2 = (2ABC + 2CBA - BAC - CAB - ACB - BCA)/2.

If sign is True, it returns

\lbrace[A, B], C\rbrace/2 + \lbrace A, [B, C]\rbrace/2 = (2ABC - 2CBA - BAC + CAB - ACB + BCA)/2.

Deprecated since version 0.24.0

The function qiskit.opflow.utils.double_commutator() is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit https://qisk.it/opflow_migration.

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

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