Valerio Bitetta

changed backend to reflect proposed architecture

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4.1.3 Solving combinatorial optimization problems using QAOA # Changes made Changed backend to Yorktown and updated the optimization results accordingly # Justification Santiago does not seem to have a 'butterfly'...

changed the method for non-local quantum error

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### Summary For adding non-local quantum error the wrong method was indicated. ### Details and comments I changed `add_quantum_error` to `add_nonlocal_quantum_error`