- Letter
Spin squeezing from bilinear spin-spin interactions: Two simple theorems
Phys. Rev. A 104, L040601 – Published 26 October, 2021
DOI: https://doi.org/10.1103/PhysRevA.104.L040601
Abstract
We prove two simple theorems about squeezing induced by bilinear spin-spin interactions that conserve spin parity—including a vast majority of quantum spin models implemented by state-of-the-art quantum simulators. In particular we show that squeezing captures the first form of quantum correlations which are produced (1) at equilibrium, by adiabatically turning on the spin-spin interactions starting from a factorized state aligned with an external, arbitrary field; and (2) away from equilibrium, by evolving unitarily the same state with the interacting Hamiltonian.
