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Paper Abstract and Keywords
Presentation 2019-05-20 13:20
[Poster Presentation] Experimental demonstration of adaptive quantum state estimation for dynamic quantum states
Saki Nohara, Ryo Okamoto (Kyoto Univ.), Akio Fujiwara (Osaka Univ.), Shigeki Takeuchi (Kyoto Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) For the development of quantum information technology, it is essential to provide a method to efficiently estimate the quantum state (parameter). However, the optimal measurement for estimating an unknown parameter depends on the parameter itself. In order to solve this problem, Nagaoka advocated an adaptive quantum state estimation (AQSE) procedure, where the measurement basis states are adaptively selected for each measurement result. Fujiwara proved the strong consistency and asymptotic efficiency for AQSE. However, AQSE was designed for a static quantum state, and was not applicable to dynamic states where quantum states change in time. Here, we propose a new protocol, sequential adaptive quantum state estimation for quantum states changing in time, and confirm its validity by experimental demonstration. We believe this new protocol will open up the use of quantum state estimation for various applications including biology, e.g. monitoring the motion of fluorescent molecules.
Keyword (in Japanese) (See Japanese page) 
(in English) optical phase measurement / adaptive quantum state estimation / / / / / /  
Reference Info. IEICE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee QIT  
Conference Date 2019-05-20 - 2019-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu University, Chikushi Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2019-05-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental demonstration of adaptive quantum state estimation for dynamic quantum states 
Sub Title (in English)  
Keyword(1) optical phase measurement  
Keyword(2) adaptive quantum state estimation  
1st Author's Name Saki Nohara  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Ryo Okamoto  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
3rd Author's Name Akio Fujiwara  
3rd Author's Affiliation Osaka University (Osaka Univ.)
4th Author's Name Shigeki Takeuchi  
4th Author's Affiliation Kyoto University (Kyoto Univ.)
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Date Time 2019-05-20 13:20:00 
Presentation Time 90 
Registration for QIT 
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