Conciliation of Bayes and Pointwise Quantum State Estimation: Asymptotic information bounds in quantum statistics
Richard D. Gill
备注：
Entitled "Asymptotic information bounds in quantum statistics", accepted for publication subject to expansion by inclusion of introductory material by Annals of Statistics, 2003. I missed dead-line (Lucia de B. case). This version appeared in conference proceedings given below. Finally revised and extended, co-author Madalin Guta, arXiv:1112.2078, published 2013 in another conference proceedings
发表信息：
Pages:239-261 in: Quantum Stochastics and Information - Statistics, Filtering and Control, Edited By: V P Belavkin and M Guţă. World Scientific Press, 2008
We derive an asymptotic lower bound on the Bayes risk when N identical quantum systems whose state depends on a vector of unknown parameters are jointly measured in an arbitrary way and the parameters of interest estimated on the basis of the resulting data. The bound is an integrated version of a quantum Cramér-Rao bound due to Holevo (1982), and it thereby links the fixed N exact Bayesian optimality usually pursued in the physics literature with the pointwise asymptotic optimality favoured in classical mathematical statistics. By heuristic arguments the bound can be expected to be sharp. This does turn out to be the case in various important examples, where it can be used to prove asymptotic optimality of interesting and useful measurement-and-estimation schemes. On the way we obtain a new family of "dual Holevo bounds" of independent interest.
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