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Two well-known mechanisms, one-axis twisting (OAT) and two-axiscountertwisting (TACT), generate spinsqueezed states dynamically. The latterprovides better spin squeezing (SS) but has not been demonstrated as the formof its interaction does not occur naturally in known physical systems. Severalproposals for realizing effective TACT transformed from OAT require stringentexperimental conditions in order to overcome the resulting nonstationary(oscillating) SS and continuously varying mean spin directions. This workpresents a simple scheme that solves both problems by freezing SS at an optimalpoint and realizing effectively persistent SS by inhibiting further squeezingdynamics. Explicit procedures are outlined for persistent SS of the TACT limit.Protocols based on our scheme favorably relax experimental demands, whichsignificantly brighten the prospects for realizing TACT.

Persistent atomic spin squeezing at the Heisenberg limit