Conclusive Precision Bounds for SU(1,1) Interferometers
Quantum Physics
2019-05-01 v1
Abstract
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.
Keywords
Cite
@article{arxiv.1810.08242,
title = {Conclusive Precision Bounds for SU(1,1) Interferometers},
author = {Chenglong You and Sushovit Adhikari and Xiaoping Ma and Masahide Sasaki and Masahiro Takeoka and Jonathan P. Dowling},
journal= {arXiv preprint arXiv:1810.08242},
year = {2019}
}
Comments
6 pages, 1 figure