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PauliTrotterEvolution

qiskit.opflow.evolutions.PauliTrotterEvolution(trotter_mode='trotter', reps=1) GitHub(opens in a new tab)

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.

Deprecated since version 0.24.0

The class qiskit.opflow.evolutions.pauli_trotter_evolution.PauliTrotterEvolution is deprecated as of qiskit-terra 0.24.0. It will be removed in the Qiskit 1.0 release. For code migration guidelines, visit https://qisk.it/opflow_migration(opens in a new tab).

Parameters

  • trotter_mode (str(opens in a new tab) |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(opens in a new tab) | 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

OperatorBase

evolution_for_abelian_paulisum

evolution_for_abelian_paulisum(op_sum)

Evolution for abelian pauli sum

Return type

PrimitiveOp

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

PrimitiveOp

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