Abstract
We investigate the simultaneous estimation of the intensity and the orientation of a magnetic field by the multi-parameter quantum Fisher information matrix. A general expression is achieved for the simultaneous estimation precision of the intensity and the orientation, which is better than the independent estimation precision for the given number of spin states. Moreover, we consider an imperfect measurement device, coarsened measurement reference. For the case of the measurement reference rotating around the y-axis randomly, the simultaneous estimation always performs better than the independent estimation. For all other cases, the simultaneous estimation precision will not perform better than the independent estimation when the coarsened degree is larger than a certain value.
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30 July 2019
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This research was supported by the National Natural Science Foundation of China under Grant No. 11747008 and the Guangxi Natural Science Foundation 2016GXNSFBA380227.
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Xie, D., Xu, C. Multi-parameter quantum magnetometry with spin states in coarsened measurement reference. Quantum Inf Process 18, 241 (2019). https://doi.org/10.1007/s11128-019-2351-1
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DOI: https://doi.org/10.1007/s11128-019-2351-1