# CircuitQFI¶

class CircuitQFI[source]

Bases: qiskit.aqua.operators.converters.converter_base.ConverterBase

Circuit to Quantum Fisher Information operator converter.

Converter for changing parameterized circuits into operators whose evaluation yields Quantum Fisher Information metric tensor with respect to the given circuit parameters

This is distinct from DerivativeBase converters which take gradients of composite operators and handle things like differentiating combo_fn's and enforcing product rules when operator coefficients are parameterized.

CircuitQFI - uses quantum techniques to get the QFI of circuits DerivativeBase - uses classical techniques to differentiate opflow data structures

Methods

 convert type operator OperatorBase