Beating standard quantum limit via two-axis magnetic susceptibility measurement

• URL: http://arxiv.org/abs/2109.00444v1
• Date: Wed, 1 Sep 2021 15:42:01 GMT
• Title: Beating standard quantum limit via two-axis magnetic susceptibility measurement
• Authors: Zheng-An Wang, Yi Peng, Dapeng Yu, and Heng Fan
• Abstract summary: Scheme measures magnetic susceptibility of an atomic spin ensemble along the $x$ and $z$ direction. One estimation of $phi$ can be produced with every two magnetic susceptibility data measured along the two axis.
• Score: 11.321443224184819
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report a metrology scheme which measures magnetic susceptibility of an atomic spin ensemble along the $x$ and $z$ direction and produces parameter estimation with precision beating the standard quantum limit. The atomic ensemble is initialized via one-axis spin squeezing with optimized squeezing time and parameter $\phi$ to be estimated is assumed as uniformly distributed between 0 and $2\pi$. One estimation of $\phi$ can be produced with every two magnetic susceptibility data measured along the two axis respectively, which has imprecision scaling $(1.43\pm{}0.02)/N^{0.687\pm0.003}$ with respect to the number N of atomic spins. The measurement scheme is easy to implement and thus one step towards practical application of quantum metrology.

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