qiskit.algorithms.gradients

Gradients (qiskit.algorithms.gradients)

Estimator Gradients

BaseEstimatorGradient(estimator[, options, ...])	Base class for an EstimatorGradient to compute the gradients of the expectation value.
DerivativeType(value)	Types of derivative.
FiniteDiffEstimatorGradient(estimator, epsilon)	Compute the gradients of the expectation values by finite difference method [1].
LinCombEstimatorGradient(estimator[, ...])	Compute the gradients of the expectation values.
ParamShiftEstimatorGradient(estimator[, ...])	Compute the gradients of the expectation values by the parameter shift rule [1].
SPSAEstimatorGradient(estimator, epsilon[, ...])	Compute the gradients of the expectation value by the Simultaneous Perturbation Stochastic Approximation (SPSA) [1].
ReverseEstimatorGradient([derivative_type])	Estimator gradients with the classically efficient reverse mode.

Sampler Gradients

BaseSamplerGradient(sampler[, options])	Base class for a SamplerGradient to compute the gradients of the sampling probability.
FiniteDiffSamplerGradient(sampler, epsilon)	Compute the gradients of the sampling probability by finite difference method [1].
LinCombSamplerGradient(sampler[, options])	Compute the gradients of the sampling probability.
ParamShiftSamplerGradient(sampler[, options])	Compute the gradients of the sampling probability by the parameter shift rule [1].
SPSASamplerGradient(sampler, epsilon[, ...])	Compute the gradients of the sampling probability by the Simultaneous Perturbation Stochastic Approximation (SPSA) [1].

Quantum Geometric Tensor

BaseQGT(estimator[, phase_fix, ...])	Base class to computes the Quantum Geometric Tensor (QGT) given a pure, parameterized quantum state.
LinCombQGT(estimator[, phase_fix, ...])	Computes the Quantum Geometric Tensor (QGT) given a pure, parameterized quantum state.
QFI(qgt[, options])	Computes the Quantum Fisher Information (QFI) given a pure, parameterized quantum state.
ReverseQGT([phase_fix, derivative_type])	QGT calculation with the classically efficient reverse mode.

Results

EstimatorGradientResult(gradients, metadata, ...)	Result of EstimatorGradient.
QFIResult(qfis, metadata, options)	Result of QFI.
QGTResult(qgts, derivative_type, metadata, ...)	Result of QGT.
SamplerGradientResult(gradients, metadata, ...)	Result of SamplerGradient.