def _measurement_key_obj_(self) -> cirq.MeasurementKey:
        """Return the key object that will be used to identify this measurement.

        When a measurement occurs, either on hardware, or in a simulation,
        this is the key value under which the results of the measurement
        will be stored.
        """
Return the key object that will be used to identify this measurement.

        When a measurement occurs, either on hardware, or in a simulation,
        this is the key value under which the results of the measurement
        will be stored.
        
cirq-core/cirq/protocols/measurement_key_protocol.py