Extended Data Fig. 2: Insertion loss of the ion trap system measured using the QVSA and a commercial vector network analyzer (VNA).
From: Wideband electric field quantum sensing via motional Raman transitions
The wideband transfer function of a qubit control line is compared against that from a traditional measurement using a capacitor divider connected to trapping RF electrodes and a vector network analyzer over the frequency range accessible with our DDS (20 MHz - 300 MHz). The traditional measurement fails to accurately report the filter function. Changes to the measurement conditions required to interface the network analyzer, for example impedance changes at measurement ports, likely account for this discrepancy, serving as an archetypal example of the difficulty of accurately calibrating qubit signals. Blue (red) data shows the insertion loss measured by the QVSA (VNA). Error bars for the QVSA measurements represent one standard error and are too small to be seen.
