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I want to try the UCC ansatz for problems other than quantum chemistry. For that I want to 'extract' the UCC ansatz (say from Qiskit) and supply it to my own VQE: I need a parameterised circuit where everything else is already set up.

How do I do that?

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  • $\begingroup$ I'm not sure I quite understand the problem. Do you want to use the UCC ansatz from Qiskit (if yes, why not just import it) or create a new parameterized circuit (which you could also create with Qiskit)? $\endgroup$
    – Cryoris
    Dec 2, 2021 at 7:45

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UCC ansatz is already a parametrized circuit, since it extends EvolvedOperatorAnsatz, which extends NLocal. You can parametrize it manually using assign_parameters(parameters) where parameters is a list of values. You can add the created circuit to your remaining circuit using standard circuit.compose.

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