Update qiskit_experiments/library/characterization/fine_amplitude.py

Author: nkanazawa1989

qiskit_experiments/library/characterization/fine_amplitude.py

@@ -134,7 +134,7 @@ def __init__(self, qubit: int, gate: Gate, backend: Optional[Backend] = None):
             backend: Optional, the backend to run the experiment on.
         """
         super().__init__([qubit], backend=backend)
-        self.experiment_options.gate = gate
+        self.set_experiment_options(gate=gate)
 
     def _pre_circuit(self) -> QuantumCircuit:
         """Return a preparation circuit.