Many-particle entanglement criterion for superradiant-like states

Abstract

We derive a many-particle inseparability criterion for mixed states using the relation between single-mode and many-particle nonclassicalities. It works very well not only in the vicinity of the Dicke states, but also for the superposition of them: superradiant ground state of finite/infinite number of particles and time evolution of single-photon superradiance. We also obtain a criterion for ensemble-field entanglement which works fine for such kind of states. Even though the collective excitations of the many-particle system is sub-Poissonian --which results in entanglement-- the wave function displays bunching.

7 pages, 6 figures

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• Nonclassicality and entanglement for wavepackets
• A binary mixture of Bose-Einstein-condensates in a double-well potential: Berry phase and two-mode entanglement
• Ultra-large actively tunable photonic band gaps via plasmon-analog of index enhancement
• Entanglement, violation of Kramers-Kronig relation and curvature in spacetime
• Entanglement criteria for two strongly interacting ensembles
• Quantization of magnetic flux and electron-positron pair creation