  Dynamical Decoupling (DD) is perhaps the simplest and least
resource-intensive error suppression strategy for improving quantum computer
performance. Here we report on a large-scale survey of the performance of 60
different DD sequences from 10 families, including basic as well as advanced
sequences with high order error cancellation properties and built-in
robustness. The survey is performed using three different superconducting-qubit
IBMQ devices, with the goal of assessing the relative performance of the
different sequences in the setting of arbitrary quantum state preservation. We
find that the high-order universally robust (UR) and quadratic DD (QDD)
sequences generally outperform all other sequences across devices and pulse
interval settings. Surprisingly, we find that DD performance for basic
sequences such as CPMG and XY4 can be made to nearly match that of UR and QDD
by optimizing the pulse interval, with the optimal interval being substantially
larger than the minimum interval possible on each device.
