A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound

Details A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound A New Strategy of Quantum-State Estimation for Achieving the Cramer-Rao Bound

2002-09-11

arxiv.org/abs/quant-ph/0209074v1

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

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.

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