Chin. Phys. Lett.  2020, Vol. 37 Issue (4): 044209    DOI: 10.1088/0256-307X/37/4/044209
High-Fidelity Manipulation of the Quantized Motion of a Single Atom via Stern–Gerlach Splitting
Kun-Peng Wang1,2,3, Jun Zhuang1,2,3, Xiao-Dong He1,2**, Rui-Jun Guo1,2,3, Cheng Sheng1,2, Peng Xu1,2, Min Liu1,2, Jin Wang1,2, Ming-Sheng Zhan1,2**
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071
2Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
3University of Chinese Academy of Sciences, Beijing 100049
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Kun-Peng Wang, Jun Zhuang, Xiao-Dong He et al  2020 Chin. Phys. Lett. 37 044209
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Abstract We demonstrate high-fidelity manipulation of the quantized motion of a single $^{87}$Rb atom in an optical tweezer via microwave couplings induced by Stern–Gerlach splitting. The Stern–Gerlach splitting is mediated by polarization gradient of a strongly focused tweezer beam that functions as fictitious magnetic field gradient. The spatial splitting removes the orthogonality of the atomic spatial wavefunctions, thus enables the microwave couplings between the motional states. We obtain coherent Rabi oscillations for up to third-order sideband transitions, in which a high fidelity of larger than $0.99$ is obtained for the spin-flip transition on the first order sideband after subtraction of the state preparation and detection error. The Stern–Gerlach splitting is measured at a precision of better than $0.05$ nm. This work paves the way for quantum engineering of motional states of single atoms, and may have wide applications in few body physics and ultracold chemistry.
Received: 18 January 2020      Published: 06 March 2020
PACS:  42.50.Dv (Quantum state engineering and measurements)  
  32.80.Qk (Coherent control of atomic interactions with photons)  
  42.50.Ct (Quantum description of interaction of light and matter; related experiments)  
Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0304501, 2016YFA0302800 and 2016YFA0302002), the Key Research Program of Frontier Science of the Chinese Academy of Sciences (CAS) (Grant No. ZDBS-LY-SLH012), the National Natural Science Foundation of China (Grant No. 11774389), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21010100), and the Youth Innovation Promotion Association CAS (Grant No. 2019325).
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Kun-Peng Wang
Jun Zhuang
Xiao-Dong He
Rui-Jun Guo
Cheng Sheng
Peng Xu
Min Liu
Jin Wang
Ming-Sheng Zhan
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