A new approach to the Cramer-Rao type bound of the pure state model

Details A new approach to the Cramer-Rao type bound of the pure state model A new approach to the Cramer-Rao type bound of the pure state model

1997-11-08

arxiv.org/abs/quant-ph/9711008v1

J.Phys.A35:3111-3124,2002

Physics

Quantum Physics

LaTeX, 40 pages

Scientific paper

10.1088/0305-4470/35/13/307

In this paper, new methodology -- direct approach -- for the determination of the attainable CR type bound of the pure state model, is proposed and successfully applied to the wide variety of pure state models, for example, the 2-dimensional arbitrary model, the coherent model with arbitrary dimension. When the weight matrix is $SLD$ Fisher information, the bound is determined for arbitrary pure state models. Manifestation of complex structure in the Cramer-Rao type bound is also discussed.

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