A criterion for entanglement in two two-level systems
classification
🪐 quant-ph
keywords
entanglementsystemstwo-levelanalyzingcentralconditioncontextcouple
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We prove a necessary and sufficient condition for the occurrence of entanglement in two two-level systems, simple enough to be of experimental interest. Our results are illustrated in the context of a spin star system analyzing the exact entanglement evolution of the central couple of spins.
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