Fig. 2: Benchmarking the optimization algorithm.
From: Enhancing the coherence of superconducting quantum bits with electric fields
Rows I–III were taken at the indicated qubit operation frequencies. a Qubit T1-time vs. applied electric field. Black data points are obtained from fits to exponential decay curves as shown in Fig. 1d. Dips in T1 indicate the resonance with strongly coupled TLS. The gray curve is a 3-point nearest neighbor average, whose maximum (blue circle) is close to the determined optimum bias field. The green line indicates T1 obtained in the second pass, sweeping the field in finer steps in a small range around the E-field of previously determined T1 maximum. b Comparison of qubit T1 times between an optimized E-field bias (blue data) vs. zero applied E-field (red data), measured as a function of time during 30 min.
