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An Atomic Magnetometer with Spin-Projection Noise Proportional to $\sqrt{{T_2}}$ |
| Hai-Feng Dong1,2**, Xiao-Fei Wang1, Ji-Min Li1, Jing-Ling Chen1, Yuan Ren3 |
1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100083
2Graduate School of China Academy of Engineering Physics, Beijing 100193
3Department of Aerospace Science and Technology, Space Engineering University, Beijing 101416
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| Cite this article: |
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Hai-Feng Dong, Xiao-Fei Wang, Ji-Min Li et al 2019 Chin. Phys. Lett. 36 020701 |
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Abstract There is a common sense view for atomic magnetometers that their spin-projection-noises (SPNs) are inversely proportional to $\sqrt{{T_2}}$, where $T_2$ is the transverse relaxation time. We analyze the current atomic magnetometer types and give a counter-example of this common sense, which is the all-optical spin precession modulated three-axis atomic magnetometer proposed by our group in 2015. Unlike the other atomic magnetometers, the SPN of this kind of atomic magnetometers is proportional to $\sqrt{{T_2}}$ due to the fact that the scale factor between $P_x$ and $B$ can be unrelated to the transverse relaxation time $T_2$. We demonstrate this irrelevance experimentally and analyze the SPN theoretically. Using short-pulse ultra-high power laser to fully polarize the atoms, the phenomenon that SPN decreases with $T_2$ may also be demonstrated experimentally and a new tool for researching SPN in atomic magnetometers may be realized.
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Received: 12 September 2018
Published: 22 January 2019
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| PACS: |
07.55.Ge
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(Magnetometers for magnetic field measurements)
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32.30.Dx
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(Magnetic resonance spectra)
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51675034 and 61273067, and the Natural Science Foundation of Beijing Municipality under Grant No 7172123. |
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