DQ-mat Colloquium by Géza Thóth: Criteria fordetecting entanglement close to Dicke states with many-body correlations

Abstract:
We will review methods for detecting multipartite entanglement in an ensemble of spin-1/2 atoms with collective measurements. We will
introduce entanglement criteria based on the measurement of many-body correlations, such as the parity. Interestingly, such criteria can
detect a larger entanglement depth in some practical situations than previous methods. Our criteria require a single-particle resolution in
measuring the particle number. Entanglement detection based on many-body correlations indicate the high quality of the experimentally
produced quantum state.

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