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arXiv 1707.01433quant-ph
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量子计量精度的下限

Lower Bounds on Quantum Metrological Precision

Iagoba Apellaniz

摘要:

在这篇论文中,我们首先研究了一类对磁场非常敏感的非极化Dicke态的量子有用性。量子力学在实现如此高的精度方面起着核心作用。其次,我们调查可能的下限上的量子费舍尔信息,一个量,表征一个状态的有用性量子精密测量,使用勒让德变换的理论,使我们得到严格的下限的基础上,将用于计量的初始量子态的测量。最后但并非最不重要的是,我们研究梯度磁力学,即,我们发展了一个理论来研究某些状态对磁场空间变化的敏感性。

英文摘要:

In this thesis, first, we investigate the metrological usefulness of a family of states known as unpolarized Dicke states, which turn to be very sensitive to the magnetic field. Quantum mechanics plays a central role in achieving such a high precision. Second, we investigate possible lower bounds on the quantum Fisher information, a quantity that characterizes the usefulness of a state for quantum metrology, using the theory of Legendre transforms such that we obtain tight lower bounds based on few measurements of the initial quantum state that will be used for metrology. And last but not least, we investigate gradient magnetometry, i.e., we develop a theory to study the sensitivity of some states on the change in space of the magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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