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Paper Abstract and Keywords
Presentation 2017-11-17 10:00
Limit on Quantum State Generation under Dissipation
Kohei Kobayashi, Naoki Yamamoto (Keio Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) To realize quantum information technology, control for generating a target quantum state is highly necessary. However, in a realistic setup, a quantum state collapses to a mixed state due to dissipation, and it is impossible to generate an arbitrary quantum state generation. Therefore “the reachability analysis”, which quantifies how close the controlled system can approach to a target, is important. In this paper, we develop a general theory giving a fundamental limit on the reachability of quantum state driven by any type of control under dissipation. As an example, we give a theoretical bound on a single-spin system, double-spin system and photon number state with feedback control based on continuous measurement. Moreover, it is shown that the proposed bound can be used as a criterion of easiness of quantum state generation.
Keyword (in Japanese) (See Japanese page) 
(in English) Quantum State Generation / Quantum Feedback Control / Reachability / Dissipation / / / /  
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 2017-11-16 - 2017-11-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Saitama University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2017-11-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Limit on Quantum State Generation under Dissipation 
Sub Title (in English)  
Keyword(1) Quantum State Generation  
Keyword(2) Quantum Feedback Control  
Keyword(3) Reachability  
Keyword(4) Dissipation  
1st Author's Name Kohei Kobayashi  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Naoki Yamamoto  
2nd Author's Affiliation Keio University (Keio Univ.)
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Date Time 2017-11-17 10:00:00 
Presentation Time 25 
Registration for QIT 
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