Spin squeezing provides crucial quantum resource for quantum metrology and quantum information science. Here we propose that one axis-twisted (OAT) spin squeezing can be generated from free evolution under a general coupled-spin model with collective spin-spin interactions. We further propose pulse schemes to recover squeezing from parameter imperfections, and reach the extreme squeezing with Heisenberg-limited measurement precision scaling as 1/N for N particles. This work provides a feasible method for generating extreme spin squeezing.
@article{arxiv.2311.15667,
title = {Spin Squeezing through Collective Spin-Spin Interactions},
author = {Yanzhen Wang and Xuanchen Zhang and Yong-Chun Liu},
journal= {arXiv preprint arXiv:2311.15667},
year = {2023}
}