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

摘要

We show that the two-axis counter twisting interaction squeezes a coherentspin state into three states of interest in quantum information, namely, thetwin-Fock state, the equally-weighted superposition state, and the state thatachieves the Heisenberg limit of optimal sensitivity defined by the Cramer-Raoinequality in addition to the well-known Heisenberg-limited state of spinfluctuations.