code: def fCPHASEs(self):
          
          return {tuple(es.targets): es.fCPHASE for es in self.edges_specs}
docs: Get a dictionary of CPHASE fidelities (normalized to unity) from the specs,
          keyed by targets (qubit-qubit pairs).
  
          :return: A dictionary of CPHASE fidelities, normalized to unity.
          :rtype: Dict[tuple(int, int), float]