def _parameterize_to_phxz(symbol_id: int) -> dict[str, sympy.Symbol]:
    """Returns symbolized parameters for the gate."""

    # Parameterize single qubit gate to parameterized PhasedXZGate.
    phased_xz_params = {
        "x_exponent": sympy.Symbol(f"x{symbol_id}"),
        "z_exponent": sympy.Symbol(f"z{symbol_id}"),
        "axis_phase_exponent": sympy.Symbol(f"a{symbol_id}"),
    }
    return phased_xz_params
Returns symbolized parameters for the gate.
cirq-core/cirq/transformers/gauge_compiling/gauge_compiling.py