Abstracts
Poster Abstracts | Talk Abstracts
Conclusive precision bounds for SU(1,1) interferometers
Presenting Author: Chenglong You, Louisiana State University
Contributing Author(s): Sushovit Adhikari, Xiaoping Ma, Masahide Sasaki, Masahiro Takeoka, Jonathan P. Dowling
We revisit the quantum Fisher information (QFI) calculation in SU(1,1) interferometer considering different phase configurations. Firstly, when one of the input modes is a vacuum state, we show by using phase averaging, different phase configurations give same QFI. In this case, the QFI is linearly proportional to the average photon number of the second input state, and quadratically proportional to the average photon number generated by the OPA. This suggests that when fixing the squeezing strength of the OPA, to achieve higher sensitivity, one simply needs to inject a state with higher average photon number. Secondly, we compared the results of the phase-averaging method and the quantum Fisher information matrix method, and then we argued that for a SU(1,1) interferometer, phase averaging or quantum Fisher information matrix method is generally required, and they are essentially equivalent. Finally, we used the quantum Fisher information matrix method to calculate the precision limit for other common input states, such as two coherent state inputs or coherent state with squeezed vacuum inputs.
Read this article online: http://arxiv.org/abs/1810.08242
- Home
- SQuInT
- Registration
- Program
- Instructions for Presenters
- Survey
- Lodging and Transportation
- Hotel Floor Maps (.pdf)
- Faculty Favorites at Old Town
- Past SQuInT Meetings
SQuInT Chief Organizer
Akimasa Miyake, Associate Professor
amiyake@unm.edu
Rafael Alexander, Postdoctoral Fellow
Chris Jackson, Postdoctoral Fellow
SQuInT Administrator
Gloria Cordova
gjcordo1@unm.edu
505 277-1850
SQuInT Assistant
Wendy Jay
SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director
ideutsch@unm.edu