Quantum Non-Demolition Measurement on Spin Precession of Laser-Trapped <sup>171</sup>Yb Atoms

ORAL

Abstract

Quantum non-demolition (QND) measurement enhances the detection efficiency and measurement fidelity, and is highly desired for its applications in precision measurements and quantum information processing. We propose and demonstrate a QND scheme for the spin state of laser-trapped atoms, allowing the atoms in each spin state to be probed repeatedly. On 171Yb atoms held in an optical dipole trap, a spin-selective cycling transition is produced by introducing an ancillary laser. We measure the phase of spin precession of the 171Yb atoms in a 20-mG bias magnetic field. The QND approach reduces the measurement noise by ∼19 dB, to a level of 2.4 dB below the atom shot noise.

*This work has been supported by the Strategic PriorityResearch Program of the Chinese Academy of Sciencesthrough Grant No. XDB21010200 and by the National Natural Science Foundation of China (NSFC) throughGrants No. 91636215, No. 11704368, and Anhui Initiative in Quantum Information Technologies through Grant No. AHY110000.

–

Publication: Y. A. Yang, T. A. Zheng, Chang-Ling Zou, T. Xia, Z.-T. Lu. Quantum Non-Demolition Measurement on Spin Precession of Laser-Trapped 171Yb Atoms. (2021) Unpublished manuscript.

Presenters

  • Yang Yang

    • University of Science and Technology of China

Authors

  • Yang Yang

    • University of Science and Technology of China

  • Tao Zheng

    • University of Science and Technology of China

  • Chang-Ling Zou

    • University of Science and Technology of China

  • Tian Xia

    • University of Science and Technology of China

  • Zheng-Tian Lu

    • University of Science and Technology of China
    • USTC