Precision Measurements Using Squeezed Spin States via Two-axis Counter-twisting Interactions

TL;DR

This paper demonstrates how two-axis counter-twisting interactions can generate highly squeezed spin states, including states useful for quantum information and precision measurement, reaching the Heisenberg limit of sensitivity.

Contribution

It introduces a method to produce various highly squeezed and entangled spin states using two-axis counter-twisting interactions, advancing quantum metrology techniques.

Findings

Generation of twin-Fock, superposition, and Heisenberg-limited states

Achievement of optimal sensitivity at the Heisenberg limit

Enhanced quantum information processing capabilities

Abstract

We show that the two-axis counter twisting interaction squeezes a coherent spin state into three states of interest in quantum information, namely, the twin-Fock state, the equally-weighted superposition state, and the state that achieves the Heisenberg limit of optimal sensitivity defined by the Cramer-Rao inequality in addition to the well-known Heisenberg-limited state of spin fluctuations.