Conclusive precision bounds for SU(1,1) interferometers

Conclusive precision bounds for SU(1,1) interferometers
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DOI:
10.1103/physreva.99.042122
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发表时间:
2018-10
期刊:
影响因子:
2.9
通讯作者:
Chenglong You;S. Adhikari;Xiaoping Ma;M. Sasaki;M. Takeoka;J. Dowling
Chenglong You;S. Adhikari;Xiaoping Ma;M. Sasaki;M. Takeoka;J. Dowling
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chenglong You;S. Adhikari;Xiaoping Ma;M. Sasaki;M. Takeoka;J. Dowling

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本文研究了SU(1,1)干涉仪中不同相位组态下的量子Fisher信息(QFI)计算。当其中一个输入模为真空态时,我们利用相位平均法证明了不同的相位组态给出相同的QFI。此外,通过铸造的相位估计作为一个两个参数的估计问题,我们表明,量子Fisher信息矩阵的计算(QRST)是必要的一般。特别地,在该设置内,相位平均方法等效于两个参数估计问题。我们还计算了不同的输入状态下的相位灵敏度使用Qdron方法。
In this paper, we revisit the quantum Fisher information (QFI) calculation in SU(1,1) interferometer considering different phase configurations. When one of the input modes is a vacuum state, we show by using phase averaging, different phase configurations give same QFI. In addition, by casting the phase estimation as a two-parameter estimation problem, we show that the calculation of the quantum Fisher information matrix (QFIM) is necessary in general. Particularly, within this setup, the phase averaging method is equivalent to a two parameter estimation problem. We also calculate the phase sensitivity for different input states using QFIM approach.