Exploit symmetry in QFI and Hessian construction

qiskit-community / qiskit-aqua

Quantum Algorithms & Applications (**DEPRECATED** since April 2021 - see readme for more info)

https://qiskit.org/aqua

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Exploit symmetry in QFI and Hessian construction #1503

Closed Zoufalc closed 3 years ago

Zoufalc commented 3 years ago

What is the expected enhancement?

The Quantum Fisher Information (QFI) and the Hessian with respect to the supported types of parameterized quantum circuits are symmetric. However, the current implementation evaluates every entry individually without taking this symmetry into account.

woodsp-ibm commented 3 years ago

Should this be opened on the Terra repo now that opflow/gradients are maintained there.

Zoufalc commented 3 years ago

Sure will do.

woodsp-ibm commented 3 years ago

Closing as this was migrated to Terra https://github.com/Qiskit/qiskit-terra/issues/5631