Fix layout not applied when running on hardware #262
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Summary
This PR fix issue when running QAOA on hardware.
Specifically, it solves observable dimension not matching the circuit's layout, e.g.:
ValueError: The number of qubits of the circuit (133) does not match the number of qubits of the ()-th observable (16).Details and comments
The PR applies the circuit layout to the observable if the circuit has a layout.