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
影响因子:
2.9
通讯作者:
Chenglong You;S. Adhikari;Xiaoping Ma;M. Sasaki;M. Takeoka;J. Dowling
中科院分区:
文献类型:
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作者:
Chenglong You;S. Adhikari;Xiaoping Ma;M. Sasaki;M. Takeoka;J. Dowling
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.