Deprecated: Compute the Quantum Fisher Information (QFI).
Computes the QFI given a pure, parameterized quantum state, where QFI is:
qiskit.opflow.gradients.qfi.QFI 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 (opens in a new tab).
- operator (CircuitStateFn) – The operator corresponding to the quantum state |ψ(ω)〉for which we compute the QFI
- params (ParameterVector |ParameterExpression |List (opens in a new tab)[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.
ListOp[ListOp] where the operator at position k,l corresponds to QFI_kl
ValueError (opens in a new tab) – If operator is not parameterized.