Coherence Preservation of a Single Neutral Atom Qubit Transferred between Magic-Intensity Optical Traps

Jiaheng Yang, Xiaodong He, Ruijun Guo, Peng Xu, Kunpeng Wang, Cheng Sheng, Min Liu, Jin Wang, Andrei Derevianko, and Mingsheng Zhan
Phys. Rev. Lett. 117, 123201 – Published 14 September 2016
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Abstract

We demonstrate that the coherence of a single mobile atomic qubit can be well preserved during a transfer process among different optical dipole traps (ODTs). This is a prerequisite step in realizing a large-scale neutral atom quantum information processing platform. A qubit encoded in the hyperfine manifold of an Rb87 atom is dynamically extracted from the static quantum register by an auxiliary moving ODT and reinserted into the static ODT. Previous experiments were limited by decoherences induced by the differential light shifts of qubit states. Here, we apply a magic-intensity trapping technique which mitigates the detrimental effects of light shifts and substantially enhances the coherence time to 225±21ms. The experimentally demonstrated magic trapping technique relies on the previously neglected hyperpolarizability contribution to the light shifts, which makes the light shift dependence on the trapping laser intensity parabolic. Because of the parabolic dependence, at a certain “magic” intensity, the first order sensitivity to trapping light-intensity variations over ODT volume is eliminated. We experimentally demonstrate the utility of this approach and measure hyperpolarizability for the first time. Our results pave the way for constructing scalable quantum-computing architectures with single atoms trapped in an array of magic ODTs.

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  • Received 17 June 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.123201

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Jiaheng Yang1,2, Xiaodong He1,3,*, Ruijun Guo1,2, Peng Xu1,3, Kunpeng Wang1,2, Cheng Sheng1, Min Liu1,3, Jin Wang1,3, Andrei Derevianko4,3, and Mingsheng Zhan1,3,†

  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
  • 2School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China
  • 4Department of Physics, University of Nevada, Reno, Nevada 89557, USA

  • *hexd@wipm.ac.cn
  • mszhan@wipm.ac.cn

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Issue

Vol. 117, Iss. 12 — 16 September 2016

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