A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound
Quantum Physics
2013-05-29 v1
Abstract
We experimentally analyzed the statistical errors in quantum-state estimation and examined whether their lower bound, which is derived from the Cramer-Rao inequality, can be truly attained or not. In the experiments, polarization states of bi-photons produced via spontaneous parametric down-conversion were estimated employing tomographic measurements. Using a new estimation strategy based on Akaike's information criterion, we demonstrated that the errors actually approach the lower bound, while they fail to approach it using the conventional estimation strategy.
Cite
@article{arxiv.quant-ph/0209074,
title = {A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound},
author = {Koji Usami and Yoshihiro Nambu and Yoshiyuki Tsuda and Keiji Matsumoto and Kazuo Nakamura},
journal= {arXiv preprint arXiv:quant-ph/0209074},
year = {2013}
}
Comments
4 pages, 2 figures