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.
*This work has been supported by the Strategic Priority Research Program of the Chinese Academy of Sciences through Grant No. XDB21010200 and by the National Natural Science Foundation of China (NSFC) through grants No. 91636215, No. 11704368, and Anhui Initiative in Quantum Information Technologies through Grant No. AHY110000.
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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. [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. [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 Unpublished manuscript.
