• Chinese Optics Letters
  • Vol. 20, Issue 2, 020201 (2022)
Dianqiang Su1、2, Xiateng Qin1、2, Yuan Jiang1、2, Kaidi Jin1、2, Zhonghua Ji1、2, Yanting Zhao1、2、*, Liantuan Xiao1、2, and Suotang Jia1、2
Author Affiliations
  • 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
  • 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
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    Abstract

    We report the experimental realization of dark state atoms trapping in a nanofiber optical lattice. By applying the magic-wavelength trapping potentials of cesium atoms, the AC Stark shifts are strongly suppressed. The dark magneto-optical trap efficiently transfers the cold atoms from bright (6S1/2, F = 4) into dark state (6S1/2, F = 3) for hyperfine energy levels of cesium atoms. The observed transfer efficiency is as high as 98% via saturation measurement. The trapping lifetime of dark state atoms trapped by a nanofiber optical lattice is also investigated, which is the key element for realizing optical storage. This work contributes to the manipulation of atomic electric dipole spin waves and quantum information storage for fiber networks.

    1. Introduction

    Along with the development of the magneto-optical trap (MOT) technique, many species of atoms have been successfully trapped and greatly isolated from the external environment[13]. It makes them promising for the realizations of quantum repeater and quantum networks[46]. In order to realize the control and manipulation for atomic states, the trapped atoms need to efficiently interface with resonant probe light via atom–light interaction[711]. In this respect, a tapered optical nanofiber provides an ideal platform. The strong confinement evanescent field near the nanofiber improves atom–light coupling and allows atomic trapping near the nanofiber surface[1214]. In recent years, two-color trappings including a state-insensitive nanofiber trap for atoms have been realized[1517]. The atoms are trapped in a one-dimensional optical lattice near the nanofiber surface. Due to the collisional blockade effect[18,19], at most, one atom can be located for each optical lattice site. The strong coupling between the trapped atomic array and fiber-guided mode contributes to the study of chiral quantum optics[20], collective excitation[21], and correlating photons under nonlinear response[22]. Using electromagnetically induced transparency, slow light and the storage of optical pulses are also realized in the nanofiber optical lattice[23,24]. In the nanofiber trapping regime, the optical depth (OD) can reach a few percent per atom, which enables the large OD with a trapped atomic array and confirms it as a viable platform for studying atom–light interactions.

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    Dianqiang Su, Xiateng Qin, Yuan Jiang, Kaidi Jin, Zhonghua Ji, Yanting Zhao, Liantuan Xiao, Suotang Jia. Dark state atoms trapping in a magic-wavelength optical lattice near the nanofiber surface[J]. Chinese Optics Letters, 2022, 20(2): 020201
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    Category: Atomic and Molecular Optics
    Received: Aug. 1, 2021
    Accepted: Nov. 2, 2021
    Posted: Nov. 3, 2021
    Published Online: Nov. 19, 2021
    The Author Email: Yanting Zhao (zhaoyt@sxu.edu.cn)