  We report a comparative study on microwave control lines for a transmon qubit
using: (i) flexible stripline transmission lines, and (ii) semi-rigid coaxial
cables. During each experiment we performed repeated measurements of the energy
relaxation and coherence times of a transmon qubit using one of the wiring
configurations. Each measurement run spanned 70 h to 250 h of measurement time,
and four separate cooldowns were performed so that each configuration could be
tested twice. From these datasets we observe that changing the microwave
control lines from coaxial cables to flexible stripline transmission lines does
not have a measurable effect on coherence compared to thermal cycling the
system, or random coherence fluctuations. Our results open up the possibility
of large scale integration of qubit control lines with integrated component
with planar layouts on flexible substrate.
