TY - JOUR
T1 - Conclusive precision bounds for SU(1,1) interferometers
AU - You, Chenglong
AU - Adhikari, Sushovit
AU - Ma, Xiaoping
AU - Sasaki, Masahide
AU - Takeoka, Masahiro
AU - Dowling, Jonathan P.
N1 - Funding Information:
C.Y. would like to acknowledge support from Economic Development Assistantship from Louisiana State University System Board of Regents. S.A. and J.P.D. would like to acknowledge support from Army Research Office and National Science Foundation. X.P.M. acknowledges financial support from National Natural Science Foundation of China.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/4/24
Y1 - 2019/4/24
N2 - 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 the 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.
AB - 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 the 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.
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U2 - 10.1103/PhysRevA.99.042122
DO - 10.1103/PhysRevA.99.042122
M3 - Article
AN - SCOPUS:85064821056
SN - 2469-9926
VL - 99
JO - Physical Review A
JF - Physical Review A
IS - 4
M1 - 042122
ER -