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arXiv 1503.00236quant-ph
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利用直接量子反馈提高最优量子估计的参数精度

Enhancing parameter precision of optimal quantum estimation by direct quantum feedback

Qiang Zheng, Li Ge, Yao Yao, Qi-jun Zhi

摘要:

人们已经提出了各种方案来克服量子增强参数估计中的退相干问题。在这里,我们提出了另一种方法,量子反馈,以提高最佳量子估计的参数精度的耗散量子比特通过研究其量子费舍尔信息的动力学。我们发现,与无反馈情况相比,有反馈情况下耗散量子比特的量子费舍尔信息在时间演化上有较大的极大值,在较长时间内衰减速率较小。

英文摘要:

Various schemes have been proposed to overcome the drawback of the decoherence on quantum-enhanced parameter estimation. Here we suggest an alternative method, quantum feedback, to enhance the parameter precision of optimal quantum estimation of a dissipative qubit by investigating its dynamics of quantum Fisher information. We find that compared with the case without feedback, the quantum Fisher information of the dissipative qubit in the case of feedback has a large maximum value in time evolution and a smaller decay rate in the long time.

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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