def decoherence_pauli_error(
    t1_ns: float, tphi_ns: float, gate_time_ns: float
) -> float:  # pragma: no cover
    """The component of Pauli error caused by decoherence on a single qubit.

    Args:
        t1_ns: T1 time in nanoseconds.
        tphi_ns: Tphi time in nanoseconds.
        gate_time_ns: Duration in nanoseconds of the gate affected by this error.

    Returns:
        Calculated Pauli error resulting from decoherence.
    """
    return qis.decoherence_pauli_error(t1_ns, tphi_ns, gate_time_ns)
The component of Pauli error caused by decoherence on a single qubit.

    Args:
        t1_ns: T1 time in nanoseconds.
        tphi_ns: Tphi time in nanoseconds.
        gate_time_ns: Duration in nanoseconds of the gate affected by this error.

    Returns:
        Calculated Pauli error resulting from decoherence.
    
cirq-core/cirq/devices/noise_utils.py