Hartree-Fock reference state for VQE using Bravy-Kitaev mapping and tapering

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I would like to know how I can construct a Hartree-Fock reference state for VQE using Bravy-Kitaev mapping and tapering. I know it’s possible to achieve it using Jordan-Wigner, but is there any possibility of achieving it with Bravy-Kitaev?

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Hi @alima , welcome to the Forum!

We have a qml.bravyi_kitaev feature that allows you to convert a fermionic operator to a qubit operator using the Bravyi-Kitaev mapping. It works similar to the qml.jordan_wigner() feature.

I think the PennyLane demo on mapping Fermionic Hamiltonians to qubit Hamiltonians has exactly what you’re looking for, including a section on energy calculation.

I hope this helps, and let us know if you have any follow up questions!

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