def METHOD_NAME(self):
    """Yields CZ gates used in the variational circuit."""
    # U
    for q in range(0, self.subsize - 1, 2):
        yield gates.CZ(q, q + 1)
    # V
    for q in range(self.subsize, self.nqubits - 1, 2):
        yield gates.CZ(q, q + 1)