Replaced deprecated Qiskit classes by their respective replacement functions #237
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Summary
Fixes #231.
This PR replaces most of the uses of the deprecated classes based on
BlueprintCircuitby their function counterpart. Some are left in tests, andEvolvedOperatorAnsatzis still used inAdaptVQE.VQD,VQEandSamplingVQEnow raise warnings upon setting the number of qubits of their ansatz.Since it seems that
PhaseOraclewill be deprecated in Qiskit 2.2 in profit ofPhaseOraclegate, I went ahead and added support for the latter inAmplificationProblemandGrover.Concerning
AdaptVQE, following the discussion in #231, I went for adding a lot of keyword-only arguments. This allows for instantiating it using the new technique without too much code, just like the user would have instantiated itsEvolvedOperatorAnsatz. There's a concern on the typing ofVQEansatz though. On the one hand, I don't really like allowing the ansatz to beNonesince I don't think it makes much sense, but on the other hand it's a bit ridiculous to passQuantumCircuit(1)toVQE... Note that this is a typing-only problem: if the user actually passesNonefor the ansatz, it will work just fine.