Figure 4
From: Achieving quantum precision limit in adaptive qubit state tomography
Precision limit with respect to the MSB and WMSEs. In the experiment, N=1,200 and N1=300; each data point is an average over 1,000 repetitions and the error bar denotes the s.d. of the mean. (Upper plot) MSBs of standard, adaptive and known-state tomography together with the GM bound. The MSB of the known-state tomography is slightly smaller than the GM bound when the purity of the true state is sufficiently high (depending on N) because the estimator is biased due to the influence of the boundary of the state space. (Lower plot) WMSEs with respect to the family of monotone Riemannian metrics determined by Equation (6) for a state with s=0.9.
