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Journal of Mathematical Physics : Asymptotic performance of optimal state estimation in qubit system

By Masahito Hayashi and Keiji Matsumoto

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Book Id: WPLBN0002169531
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 2 October 2008

Title: Journal of Mathematical Physics : Asymptotic performance of optimal state estimation in qubit system  
Author: Masahito Hayashi and Keiji Matsumoto
Volume: Issue : October 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Mathematical Physics Collection
Historic
Publication Date:
2008
Publisher: American Institute of Physics

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And Keiji Matsumoto, M. H. (2008). Journal of Mathematical Physics : Asymptotic performance of optimal state estimation in qubit system. Retrieved from http://worldlibrary.in/


Description
Description: We derive an asymptotic bound for the error of state estimation when we are allowed to use the quantum correlation in the measuring apparatus. It is also proven that this bound can be achieved in any statistical model in the qubit system. Moreover, we show that this bound cannot be attained by any quantum measurement with no quantum correlation in the measuring apparatus except for several specific statistical models. That is, in such a statistical model, the quantum correlation can improve the accuracy of the estimation in an asymptotic setting.

 

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