Simulations of two qubit gate dynamics have illustrated well known trade-offs

Simulations of two qubit gate dynamics have illustrated the well known trade-off between coherent and incoherent errors as a function of gate speed. Faster gates are less susceptible to the incoherent error caused by qubit relaxation, while slower gates have lower levels of coherent error due to unwanted interactions with the non-computational states of the transmon. Recent improvements in our junction fabrication processes and cryo-packaging have led to the realization of fixed frequency qubits with lifetimes and coherence times in excess of 100 us. This suggests that we may be able to reach error rates as low as 0.1% with an optimal choice of gate time.