Enhancing parameter precision of optimal quantum estimation by direct quantum feedback
Quantum Physics
2015-06-24 v1
Abstract
Various schemes have been proposed to overcome the drawback of the decoherence on quantum-enhanced parameter estimation. Here we suggest an alternative method, quantum feedback, to enhance the parameter precision of optimal quantum estimation of a dissipative qubit by investigating its dynamics of quantum Fisher information. We find that compared with the case without feedback, the quantum Fisher information of the dissipative qubit in the case of feedback has a large maximum value in time evolution and a smaller decay rate in the long time.
Cite
@article{arxiv.1503.00236,
title = {Enhancing parameter precision of optimal quantum estimation by direct quantum feedback},
author = {Qiang Zheng and Li Ge and Yao Yao and Qi-jun Zhi},
journal= {arXiv preprint arXiv:1503.00236},
year = {2015}
}
Comments
6 pages, 8 figures, accepted for publication in Physical Review A