\begin{document}$\alpha \left\vert W_N \right\rangle +\sqrt{1-\alpha^2}\left\vert 00\cdots0\right\rangle$\end{document}) under local operation and Lipkin-Meshkov-Glick (LMG) model. Furthermore, with the general Cramér-Rao lower bound (CRLB) we analyze its performance in high-precision phase measurement. The results show that, under the local operation, the QFI of an N-qubit WV state becomes larger with the increase of parameter α. This not only means the enhanced quantum entanglement, but also implies the powerful ability in high-precision quantum measurement. In the LMG model, as the increase of interactional strength γ the QFI of \begin{document}$N=3$\end{document} qubits WV state gradually tends to be stable and almost not be affected by parameter α, which relaxes the requirement in the preparation of target state and indicates a great potential in achieving the relatively stable measurement precision. When the number of qubits from WV state is larger than 3, the QFI of WV state increases with the increase of parameter α. In the case of fixed parameter α, we investigate the QFI of an N-qubit WV state with respect to interaction strength γ. It is found that the QFI of WV state will increase with the increasing interaction strength, which implies that the greater the interaction strength, the stronger the quantum measurement ability of the WV state. Our work will promote the development of high-precision quantum metrology and especially the interaction-enhanced quantum measurement, and further provide new insights in quantum information processing."> - 必威体育下载

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Citation:

    Li Yan, Ren Zhi-Hong
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    • Abstract views:1990
    • PDF Downloads:82
    • Cited By:0
    Publishing process
    • Received Date:20 July 2023
    • Accepted Date:20 August 2023
    • Available Online:05 September 2023
    • Published Online:20 November 2023

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