Work

Spin squeezing with arbitrary quadratic collective-spin interactions

Year: 2023

Type: article

Abstract: Spin squeezing is vitally important in quantum metrology and quantum information science. The noise reduction resulting from spin squeezing can surpass the standard quantum limit and even reach the Heisenberg limit (HL) in some special circumstances. However, systems that can reach the HL are very limited. Here, we study the spin squeezing in atomic systems with a generic form of the quadratic collective-spin interaction, which can be described by the Lipkin-Meshkov-Glick model. We find that the squeezing properties are determined by the initial states and the anisotropic parameters. Moreover, we propose a pulse rotation scheme to transform the model into a two-axis twisting model with Heisenberg-limited spin squeezing. Our study paves the way for reaching HL in a broad variety of systems.

Source: Physical Review A

DOI: 10.1103/physreva.108.023722

Authors: Zhiyao Hu, Qixian Li, Xuanchen Zhang, Long-Gang Huang, He-bin Zhang, Yong-Chun Liu