The maximum photon emission rate in atomic ensembles scales universally as atom number times optical depth at fixed density, unifying ordered and disordered systems from independent emission to the Dicke limit.
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A stochastic unravelling that stays inside the permutation-symmetric subspace cuts simulation cost for N two-level emitters from O(N^5) to O(N^2) (or O(N) with extra symmetries) and extends to d-level emitters.
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Optical depth dictates universal bounds on many-body decay in atomic ensembles
The maximum photon emission rate in atomic ensembles scales universally as atom number times optical depth at fixed density, unifying ordered and disordered systems from independent emission to the Dicke limit.
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Permutation-symmetric quantum trajectories
A stochastic unravelling that stays inside the permutation-symmetric subspace cuts simulation cost for N two-level emitters from O(N^5) to O(N^2) (or O(N) with extra symmetries) and extends to d-level emitters.