Quantum multiparameter metrology with generalized entangled coherent state
Quantum Physics
2016-02-04 v2
Abstract
We propose a generalized form of entangled coherent states (ECS) and apply them in a multi-arm optical interferometer to estimate multiple phase shifts. We obtain the quantum Cramer-Rao bounds for both the linear and nonlinear parameterization protocols. Through the analysis, we find that, utilizing the simultaneous estimation, this generalized form of ECS gives a better precision than the generalized NOON states [Phys. Rev. Lett. \textbf{111}, 070403 (2013)]. Moreover, comparing with the independent estimation, both the linear and nonlinear protocols have the same advantage in the relation to the number of the parameters.
Cite
@article{arxiv.1409.6167,
title = {Quantum multiparameter metrology with generalized entangled coherent state},
author = {Jing Liu and Xiao-Ming Lu and Zhe Sun and Xiaoguang Wang},
journal= {arXiv preprint arXiv:1409.6167},
year = {2016}
}
Comments
12 pages, 4 figures