async def list_calibrations_async(
        self, project_id: str, processor_id: str, filter_str: str = ''
    ) -> list[quantum.QuantumCalibration]:
        """Returns a list of quantum calibrations.

        Args:
            project_id: A project_id of the parent Google Cloud Project.
            processor_id: The processor unique identifier.
            filter_str: Filter string current only supports 'timestamp' with values
            of epoch time in seconds or short string 'yyyy-MM-dd'. For example:
                'timestamp > 1577960125 AND timestamp <= 1578241810'
                'timestamp > 2020-01-02 AND timestamp <= 2020-01-05'

        Returns:
            A list of calibrations.
        """
        request = quantum.ListQuantumCalibrationsRequest(
            parent=_processor_name_from_ids(project_id, processor_id), filter=filter_str
        )
        return await self._send_list_request_async(
            self.grpc_client.list_quantum_calibrations, request
        )
Returns a list of quantum calibrations.

        Args:
            project_id: A project_id of the parent Google Cloud Project.
            processor_id: The processor unique identifier.
            filter_str: Filter string current only supports 'timestamp' with values
            of epoch time in seconds or short string 'yyyy-MM-dd'. For example:
                'timestamp > 1577960125 AND timestamp <= 1578241810'
                'timestamp > 2020-01-02 AND timestamp <= 2020-01-05'

        Returns:
            A list of calibrations.
        
cirq-google/cirq_google/engine/engine_client.py