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Paper Abstract and Keywords
Presentation 2016-05-30 13:00
[Poster Presentation] Estimation of Parameters in a Qubit Channel with the Help of Entanglement with an Ancilla Qubit
Yasunari Tanaka, Kazuya Yuasa (Waseda Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) We discuss the estimation of a parameter contained in a quantum channel.
In the standard strategy, we send the system prepared in a certain state into the target channel and measure some observable in the output state to collect measurement data, from which we try to estimate a target parameter.
In this study, we introduce an auxiliary system which is to be entangled with the main system to enhance the precision of the estimation.
We study such a scheme for parameter estimation for a qubit channel, showing that (i) the entanglement with an auxiliary system can enhance the precision of the estimation in some cases but it is not always the case, and that (ii) the optimal input state is not necessarily the maximally entangled state.
Keyword (in Japanese) (See Japanese page) 
(in English) quantum metrology / quantum channel / entanglment / / / / /  
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Conference Information
Committee QIT  
Conference Date 2016-05-30 - 2016-05-31 
Place (in Japanese) (See Japanese page) 
Place (in English) Kochi University of Technology Eikokuji campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2016-05-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Estimation of Parameters in a Qubit Channel with the Help of Entanglement with an Ancilla Qubit 
Sub Title (in English)  
Keyword(1) quantum metrology  
Keyword(2) quantum channel  
Keyword(3) entanglment  
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1st Author's Name Yasunari Tanaka  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Kazuya Yuasa  
2nd Author's Affiliation Waseda University (Waseda Univ.)
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Speaker Author-1 
Date Time 2016-05-30 13:00:00 
Presentation Time 120 minutes 
Registration for QIT 
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