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Precision protection through multi-body indirect correlations and the reconstruction of stable probe qubit system

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Abstract

The obstacle restricting us to generalize the ideal quantum metrology scheme to practice is the decay of the precision of estimation induced by the environment. When the parameter to be estimated is the phase parameter of atomic state, the loss of precision is caused by the spontaneous emission of the atom, which is the result of the interaction between the atom and the background quantum fields. Since the probe qubit constructed by the ground state and excited state of single atom is sensitive to the environment, we have provided schemes to use two proper states of n proper arrangement atoms as the new stable qubit states instead of the usual ground and excited state of single atom, to reduce the decay rate of the precision of estimation through the multi-atom indirect correlations.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grants No. 11605030, The science and technology top talent support program of Guizhou educational department under Grant No. QJHKY[2017]084 and the Scientific Research Foundation of Guiyang university under Grant No. 20160375115.

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  1. School of Electronic and Communication Engineering, Guiyang University, Guiyang, 550005, Guizhou, China

    Yao Jin

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Correspondence to Yao Jin.

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Jin, Y. Precision protection through multi-body indirect correlations and the reconstruction of stable probe qubit system. Quantum Inf Process 17, 242 (2018). https://doi.org/10.1007/s11128-018-2015-6

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