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Add forward and backward options to finite difference gradient #9096

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a-matsuo opened this issue Nov 8, 2022 · 0 comments · Fixed by #9104
Closed

Add forward and backward options to finite difference gradient #9096

a-matsuo opened this issue Nov 8, 2022 · 0 comments · Fixed by #9104
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type: feature request New feature or request

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@a-matsuo
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a-matsuo commented Nov 8, 2022

What should we add?

Currently, FiniteDiffEstimatorGradient and FiniteDiffSamplerGradient support only a central difference. A forward difference or backward difference require less circuit than the central difference, so they are faster. Also, there are cases that forward difference or backward difference can work better than central difference.
https://en.wikipedia.org/wiki/Finite_difference
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Add gradient methods to FinDiffGradients ikkoham/qiskit-terra
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