Spin squeezing generated by the anisotropic central spin model
The anisotropic central spin model can be mapped to an anisotropic Lipkin-Meshkov-Glick model when the frequency ratio is very large, inducing a one-axis twisting interaction that generates spin squeezing. The study shows that preparing the ground state or using dynamic evolution of this system yields a spin squeezing parameter scaling as N^(-2/3). Furthermore, numerical simulations reveal a critical exponent for quantum Fisher information tending toward 4/3 in the infinite limit.