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arXiv 2001.07865gr-qcquant-ph
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利用纠缠多体探针估算Unruh效应

Estimating the Unruh effect via entangled many-body probes

Jieci Wang, Li Zhang, Songbai Chen, Jiliang Jing

摘要:

研究了基于纠缠多体Unruh-DeWitt探测器的量子精密测量方案中的参数估计问题。研究发现,通过初始状态的准备和参数的选择,可以提高Unruh效应的估计精度。结果表明,在估计的Unruh温度的多体探针计量的精度总是优于两个探针策略的精度。鲍勃探测器的适当加速度以及加速度探测器与外场的相互作用对Unruh效应的估计精度有重要影响。此外,我们还发现在初始态中激发原子数较多的情况下制备的探测态比激发原子数较少的情况下制备的探测态具有更好的性能。然而,与Unruh温度的估计不同,加速探测器的有效耦合参数的估计需要更多的总原子,但较少的激发原子的估计。

英文摘要:

We study the estimation of parameters in a quantum metrology scheme based on entangled many-body Unruh-DeWitt detectors. It is found that the precision for the estimation of Unruh effect can be enhanced via initial state preparations and parameter selections. It is shown that the precision in the estimation of the Unruh temperature in terms of a many-body-probe metrology is always better than the precision in two probe strategies. The proper acceleration for Bob's detector and the interaction between the accelerated detector and the external field have significant influences on the precision for the Unruh effect's estimation. In addition, the probe state prepared with more excited atoms in the initial state is found to perform better than less excited initial states. However, different from the estimation of the Unruh temperature, the estimation of the effective coupling parameter for the accelerated detector requires more total atoms but less excited atoms in the estimations.

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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