Sub-Hertz resonance by weak measurement

Weizhi Qu, Shenchao Jin, Jian Sun, Liang Jiang, Jianming Wen () and Yanhong Xiao ()
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Weizhi Qu: Fudan University
Shenchao Jin: Fudan University
Jian Sun: Fudan University
Liang Jiang: University of Chicago
Jianming Wen: Kennesaw state University
Yanhong Xiao: Fudan University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Weak measurement (WM) with state pre- and post-selection can amplify otherwise undetectable small signals and thus has potential in precision measurement applications. Although frequency measurements offer the hitherto highest precision due to the stable narrow atomic transitions, it remains a long-standing interest to develop new schemes to further escalate their performance. Here, we demonstrate a WM-enhanced correlation spectroscopy technique capable of narrowing the resonance linewidth down to 0.1 Hz in a room-temperature atomic vapour cell. The potential of this technique for precision measurement is demonstrated through weak magnetic-field sensing. By judiciously pre- and post-selecting frequency-modulated input and output optical states in a nearly orthogonal manner, a sensitivity of 7 fT Hz−1/2 at a low frequency near DC is achieved using only one laser beam with 15 µW of power. Additionally, our results extend the WM framework to a non-Hermitian Hamiltonian and shed new light on metrology and bio-magnetic field sensing.

Date: 2020
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DOI: 10.1038/s41467-020-15557-6

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