Fig. 3: Impact of surface treatments on qubit coherence.
From: Effects of surface treatments on flux tunable transmon qubits
Mean qubit parameters pre- (y-axis) and post-treatment (x-axis) are compared, where the gray shaded area indicates a degradation and conversely the white area of the graph an improvement in the parameters. a Weighted mean of Γ1 over the entire flux interval, with the standard deviation of the spread used as weights. Error bars indicate the weighted mean of the spread. b Mean value of \({{{\Gamma }}}_{2,{{{\rm{SS}}}}}^{{{{\rm{e}}}}}\) measured at the sweet spot of the qubits. Error bars indicate the standard deviation of values measured across multiple qubits. Weighted mean values of \({A}_{{{\Phi }},1/f}^{1/2}\) (c) and \({S}_{{{\Phi }},{{{\rm{BB}}}}}^{1/2}\) (d) extracted from quadratic fits to \({{{\Gamma }}}_{2,{{\Phi }}}^{{{{\rm{e}}}}}\) and weighted by the fit error. Error bars indicate the weighted standard deviation of the mean values.
