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Paper Abstract and Keywords
Presentation 2023-12-18 17:20
Classical gravitational effect on standard quantum limit of finite-size optical lattice clock in estimating gravitational potential
Fumiya Nishimura, Yui Kuramochi, Kazuhiro Yamamoto (kyushu Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) We evaluated the accuracy limit for estimating gravitational potential using optical lattice clocks by utilizing the quantum Cram´er–Rao bound. The results indicate that the lower bound of variance of the estimator of gravitational potential using finite-size optical lattice clocks diverges and recovers repeatedly as a function of time due to the effect of the gravitational dephasing. Further, this effect creates an estimation accuracy limit when attempting to avoid the divergence of the lower bound. When the number of layers in the optical lattice clock is sufficiently large, the limit is independent of the optical lattice clock details. However, the time required to reach this limit is much longer than the current coherence time. It is extremely challenging to observe this limit, at least with current technology. This paper and presentation are based on the article [1].
Keyword (in Japanese) (See Japanese page) 
(in English) Optical lattice clock / Quantum Fisher information / Quantum Cram´er-Rao bound / Gravitational dephasing / / / /  
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Conference Information
Committee QIT  
Conference Date 2023-12-17 - 2023-12-19 
Place (in Japanese) (See Japanese page) 
Place (in English) OIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2023-12-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Classical gravitational effect on standard quantum limit of finite-size optical lattice clock in estimating gravitational potential 
Sub Title (in English) * 
Keyword(1) Optical lattice clock  
Keyword(2) Quantum Fisher information  
Keyword(3) Quantum Cram´er-Rao bound  
Keyword(4) Gravitational dephasing  
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1st Author's Name Fumiya Nishimura  
1st Author's Affiliation Kyushu University (kyushu Univ.)
2nd Author's Name Yui Kuramochi  
2nd Author's Affiliation Kyushu University (kyushu Univ.)
3rd Author's Name Kazuhiro Yamamoto  
3rd Author's Affiliation Kyushu University (kyushu Univ.)
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Speaker Author-1 
Date Time 2023-12-18 17:20:00 
Presentation Time 15 minutes 
Registration for QIT 
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