Perturbation away from U(1) symmetry in driven light-emitter ensembles with spontaneous decay produces steady states exhibiting spin squeezing that is optimal for entanglement-assisted metrology.
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Quantum correlations in the steady state of light-emitter ensembles from perturbation theory
Perturbation away from U(1) symmetry in driven light-emitter ensembles with spontaneous decay produces steady states exhibiting spin squeezing that is optimal for entanglement-assisted metrology.