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Acknowledgements
This work was supported by Natural Science Foundation of Zhejiang Province (Grant No. LR17F030005) and National Natural Science Foundation of China (Grant Nos. 61773147, 61371064, 61333011, U1509203). The authors also thank Professor Zhansheng DUAN of Xi’an Jiaotong University for his suggestion.
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Ge, Q., Chen, T., He, H. et al. Cramer-Rao lower bound-based observable degree analysis. Sci. China Inf. Sci. 62, 50209 (2019). https://doi.org/10.1007/s11432-018-9686-9
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DOI: https://doi.org/10.1007/s11432-018-9686-9