PauliTrotterEvolution
class qiskit.opflow.evolutions.PauliTrotterEvolution(trotter_mode='trotter', reps=1)
Bases: EvolutionBase
Deprecated: An Evolution algorithm replacing exponentiated sums of Paulis by changing them each to the Z basis, rotating with an rZ, changing back, and Trotterizing.
More specifically, we compute basis change circuits for each Pauli into a single-qubit Z, evolve the Z by the desired evolution time with an rZ gate, and change the basis back using the adjoint of the original basis change circuit. For sums of Paulis, the individual Pauli evolution circuits are composed together by Trotterization scheme.
The class qiskit.opflow.evolutions.pauli_trotter_evolution.PauliTrotterEvolution 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
- trotter_mode (str |TrotterizationBase | None) – A string (‘trotter’, ‘suzuki’, or ‘qdrift’) to pass to the TrotterizationFactory, or a TrotterizationBase, indicating how to combine individual Pauli evolution circuits to equal the exponentiation of the Pauli sum.
- reps (int | None) – How many Trotterization repetitions to make, to improve the approximation accuracy.
- evolution. (# TODO uncomment when we implement Abelian grouped) –
- group_paulis (#) – Whether to group Pauli sums into Abelian
- sub-groups (#) –
- group (so a single diagonalization circuit can be used for each) –
- Pauli. (# rather than each) –
Attributes
trotter
TrotterizationBase used to evolve SummedOps.
Methods
convert
convert(operator)
Traverse the operator, replacing EvolvedOps with CircuitOps containing Trotterized evolutions equalling the exponentiation of -i * operator.
Parameters
operator (OperatorBase) – The Operator to convert.
Returns
The converted operator.
Return type
evolution_for_abelian_paulisum
evolution_for_pauli
evolution_for_pauli(pauli_op)
Compute evolution Operator for a single Pauli using a PauliBasisChange.
Parameters
pauli_op (PauliOp) – The PauliOp to evolve.
Returns
A PrimitiveOp, either the evolution CircuitOp or a PauliOp equal to the identity if pauli_op is the identity.
Return type