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QFI

class QFI(qfi_method='lin_comb_full')[source]

Bases: QFIBase

Deprecated: Compute the Quantum Fisher Information (QFI).

Computes the QFI given a pure, parameterized quantum state, where QFI is:

\[\mathrm{QFI}_{kl}= 4 \mathrm{Re}[\langle \partial_k \psi | \partial_l \psi \rangle − \langle\partial_k \psi | \psi \rangle \langle\psi | \partial_l \psi \rangle].\]

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 no earlier than 3 months after the release date. For code migration guidelines, visit https://qisk.it/opflow_migration.

Methods Defined Here

convert

param operator

The operator corresponding to the quantum state |ψ(ω)〉for which we compute

Attributes

qfi_method

Returns CircuitQFI.

Returns

CircuitQFI.