docs: def fswap(p, q):
      """Decompose the Fermionic SWAP gate into two single-qubit gates and
      one iSWAP gate.
  
      Args:
          p: the id of the first qubit
          q: the id of the second qubit
      """
  
      yield cirq.ISWAP(q, p), cirq.Z(p) ** 1.5
      yield cirq.Z(q) ** 1.5