Beating standard quantum limit via two-axis magnetic susceptibility measurement
arXiv:2109.00444 · doi:10.1088/1674-1056/ac4229
Abstract
We report a metrology scheme which measures magnetic susceptibility of an atomic spin ensemble along the and 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 to be estimated is assumed as uniformly distributed between 0 and . One estimation of can be produced with every two magnetic susceptibility data measured along the two axis respectively, which has imprecision scaling 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.
arXiv comment4 pages, 2 figures, comments are most welcome
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