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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 |
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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.
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Received: 26 January 2021
Revised: 24 April 2021
Accepted manuscript online: 26 May 2021
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PACS:
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06.20.-f
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(Metrology)
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06.20.Dk
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(Measurement and error theory)
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03.75.Dg
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(Atom and neutron interferometry)
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| 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
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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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