Loads a median cirq_google.Calibration for the given device.

Real calibration data from Google's 'rainbow' and 'weber' devices has been saved in Cirq. The calibrations selected are roughly representative of the median performance for that chip.

A description of the stored metrics can be found on the calibration page.

processor_id name of the processor to simulate.

ValueError if processor_id is not a supported QCS processor.