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Chin. Phys. B, 2021, Vol. 30(12): 120601    DOI: 10.1088/1674-1056/ac0527
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Multilevel atomic Ramsey interferometry for precise parameter estimations

X N Feng(冯夏宁)1,2,† and L F Wei(韦联福)2,‡
1 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University(Zhuhai Campus), Zhuhai 519082, China;
2 Information Quantum Technology Laboratory, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
Abstract  Multi-path (or multi-mode) entanglement has been proved to be a useful resource for sub-shot-noise sensitivity of phase estimation, which has aroused much research interest in quantum metrology recently. Various schemes of multi-path interferometers based on optical systems have been put forward. Here, we study a multi-state interferometer with multi-level atoms by projective measurements. Specifically, we investigate its ultimate sensitivity described by quantum Fisher information theory and find that the Cramer-Rao bound can be achieved. In particular, we investigate a specific scheme to improve the sensitivity of magnetometery with a three-state interferometry delivered by a single nitrogen-vacancy (NV) center of diamond with tailor pulses. The impacts of imperfections of the atomic beam-splitter, described by the three-level quantum Fourier transform, on the sensitivity of phase estimation is also discussed.
Keywords:  quantum metrology      multi-path interferometers      quantum measurement  
Received:  26 January 2021      Revised:  24 April 2021      Accepted manuscript online:  26 May 2021
PACS:  06.20.-f (Metrology)  
  06.20.Dk (Measurement and error theory)  
  03.75.Dg (Atom and neutron interferometry)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11974290).
Corresponding Authors:  X N Feng, L F Wei     E-mail:  fengxianing@163.com;lfwei@swjtu.edu.cn

Cite this article: 

X N Feng(冯夏宁) and L F Wei(韦联福) Multilevel atomic Ramsey interferometry for precise parameter estimations 2021 Chin. Phys. B 30 120601

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