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arXiv 1306.0314quant-ph
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噪声辅助拉姆齐干涉测量法

Noise assisted Ramsey interferometry

U. Dorner

摘要:

我分析了一种改进的策略,通过拉姆齐干涉术的频率估计的精度与相关的退相存在的原子串。这种策略不使用纠缠态,而是使用在相关退相的影响下演化成稳态的产物态。它表明,通过使用这种状态的精度相比,标准的拉姆齐干涉测量可以得到改善。这种改进不是尺度上的改进,即估计精度与标准量子极限具有与原子数相同的尺度,而是与Ramsey干涉仪中的自由演化时间成比例的改进。由于使用了稳态,因此该演化时间可以显著大于受原子的相干时间限制的标准拉姆齐干涉测量法。

英文摘要:

I analyze a metrological strategy for improving the precision of frequency estimation via Ramsey interferometry with strings of atoms in the presence of correlated dephasing. This strategy does not employ entangled states, but rather a product state which evolves into a stationary state under the influence of correlated dephasing. It is shown that by using this state an improvement in precision compared to standard Ramsey interferometry can be gained. This improvement is not an improvement in scaling, i.e. the estimation precision has the same scaling with the number of atoms as the standard quantum limit, but an improvement proportional to the free evolution time in the Ramsey interferometer. Since a stationary state is used, this evolution time can be substantially larger than in standard Ramsey interferometry which is limited by the coherence time of the atoms.

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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