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This work was supported by National Natural Science Foundation of China (Grant Nos. 61573330, 61720106009)
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Figure 1
(Color online) (a) On-line estimation of the quantum state based on continuous weak measurements; (b) evolution trajectories of the actual state $\rho~(t)$ (red line) and the on-line estimation state $\tilde{\rho~}(t)$ (blue line) in the Bloch sphere; (c) fidelity of sampling times with three different noise amplitudes.
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