QFI
class qiskit.opflow.gradients.QFI(qfi_method='lin_comb_full')
Bases: QFIBase
Deprecated: Compute the Quantum Fisher Information (QFI).
Computes the QFI given a pure, parameterized quantum state, where QFI is:
Deprecated since version 0.24.0
The class qiskit.opflow.gradients.qfi.QFI 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.
Attributes
qfi_method
Returns CircuitQFI.
Returns
CircuitQFI.
Methods
convert
convert(operator, params=None)
Parameters
- operator (CircuitStateFn) – The operator corresponding to the quantum state |ψ(ω)〉for which we compute the QFI
- params (ParameterVector |ParameterExpression |List[ParameterExpression] | None) – The parameters we are computing the QFI wrt: ω If not explicitly passed, they are inferred from the operator and sorted by name.
Returns
ListOp[ListOp] where the operator at position k,l corresponds to QFI_kl
Raises
ValueError – If operator is not parameterized.
Return type
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