论文标题
连续量子时钟，高精度和较长的复发时间
Continuous quantum clock with high precision and long recurrence time
论文作者
论文摘要
连续时钟，即以连续方式测量时间的时钟被认为是传感技术的重要组成部分。精度和复发时间是连续时钟的两个基本特征。在本文中，在量子估计理论的框架中，提出了各种连续量子时钟的模型，其中使用了所有量子估计理论的工具来寻求具有很高精度和较长复发时间的时钟的特征。然后，在基于资源的方法中，比较了所提出的模型的性能。结果表明，基于$ n $ n $ Qubits系统的量子时钟不仅可以比基于$ 2N $一分的Quantum Clock具有更好的精度，而且还支持长期复发时间。最后，结果表明，在使用$ n $纠缠的Qubits的数量时，将时钟的精度提高了$ 1/\ sqrt n $，但它不可避免地会使时钟的复发时间恶化。
Continuous clocks, i.e. the clocks that measure time in a continuous manner, are regarded as an essential component of sensing technology. Precision and recurrence time are two basic features of continuous clocks. In this paper, in the framework of quantum estimation theory various models for continuous quantum clocks are proposed, where all tools of quantum estimation theory are employed to seek the characteristics of clocks with high precision and long recurrence time. Then, in a resource-based approach, the performance of the proposed models is compared. It is shown that quantum clocks based on $n$ two-qubits system not only can have better precision than quantum clocks based on $2n$ one-qubit system but also support long recurrence time. Finally, it is shown that while employing the number of $n$ entangled qubits improves the precision of clocks by a factor of $1/\sqrt n $, it inevitably worsens the recurrence time of the clock.
