Multiensemble superradiance yields dark states with inter-ensemble entanglement whose covariance matrices in the large-N limit optimize multiparameter spin squeezing via the Rayleigh quotient of the squeezing matrix.
Their Euclidean inner product satisfies the iden- tity A⊤ B ≡ 1, and the norm of A is ∥A∥ = C− 1/ 2, where ∥A∥ = √ A⊤ A
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Multiensemble Superradiance for Distributed Quantum Sensing
Multiensemble superradiance yields dark states with inter-ensemble entanglement whose covariance matrices in the large-N limit optimize multiparameter spin squeezing via the Rayleigh quotient of the squeezing matrix.