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Systematic errors in qubit state preparation arise due to non-idealities inthe qubit control lines such as impedance mismatch. Using a data-basedmethodology of short-open-load calibration at a temperature of 30 mK, we reportcalibrated 1-port scattering parameter data of individual qubit drive linecomponents. At 5~GHz, cryogenic return losses of a 20-dB-attenuator,10-dB-attenuator, a 230-mm-long 0.86-mm silver-plated cupronickel coaxialcable, and a 230-mm-long 0.86-mm NbTi coaxial cable were found to be35$^{+3}_{-2}$ dB, 33$^{+3}_{-2}$ dB, 34$^{+3}_{-2}$ dB, and 29$^{+2}_{-1}$ dBrespectively. For the same frequency, we also extract cryogenic insertionlosses of 0.99$^{+0.04}_{-0.04}$ dB and 0.02$^{+0.04}_{-0.04}$ dB for thecoaxial cables. We interpret the results using a master equation simulation ofall XY gates performed on a single qubit. For example, we simulate a sequenceof two 5 ns gate pulses (X & Y) through a 2-element Fabry-P\'erot cavity with276-mm path length directly preceding the qubit, and establish that the returnloss of its reflective elements must be >9.7 dB (> 14.7 dB) to obtain 99.9 %(99.99 %) gate fidelity.

Microwave calibration of qubit drive line components at millikelvin temperatures