APS Logo

Coherent Control and Precision Measurement of Nuclear Spin States in Laser-Trapped 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 develop a QND scheme for the spin state of laser-trapped atoms, allowing the fractions in each spin state to be probed repeatedly. On 171Yb (I=1/2) atoms held in an optical dipole trap, a spin-selective cycling transition is produced by introducing an ancillary laser beam. 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 an inferred level of 2.4 dB below the atomic quantum projection noise. This method is used in the measurement of the electric dipole moment of 171Yb. We also apply this QND approach in a Ramsey experiment on 173Yb (I=5/2), a multilevel quantum system.

–

Publication: [1] Zheng, T. A., Yang, Y. A., Wang, S.-Z., Singh, J. T., Xiong, Z.-X., Xia, T., & Lu, Z.-T. (2022). Measurement of the Electric Dipole Moment of 171 Yb Atoms in an Optical Dipole Trap. Physical Review Letters, 129(8), 083001.<br>[2] Yang, Y. A., Zheng, T. A., Wang, S.-Z., Hu, W.-K., Zou, C.-L., Xia, T., & Lu, Z. T. (2022). Quantum Non-Demolition Measurement on the Spin Precession of Laser-Trapped 171 Yb Atoms. arXiv preprint arXiv:2209.08218. <br>[3] Yang, Y. A., Luo, W.-T., Zhang, J.-L., Wang, S.-Z., Hu, W.-K., Zou, C.-L., Xia, T., & Lu, Z. T. (2023) Long-lived Schrödinger cat state of a high-spin nucleus. Unpublished manuscript.

Presenters

  • Yang A Yang

    University of Science and Technology of China

Authors

  • Yang A Yang

    University of Science and Technology of China

  • Tao A Zheng

    University of Science and Technology of China

  • Shao-Zheng A Wang

    University of Science and Technology of China

  • Weikang Hu

    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, University of Science and Technology of

  • Zheng-Tian Lu

    University of Science and Technology of China