Nature Communications (Oct 2017)
Entanglement between more than two hundred macroscopic atomic ensembles in a solid
Abstract
Multipartite entanglement is of both fundamental and practical interest, but is notoriously difficult to witness and characterise. Here, Zarkeshian et al. demonstrate multipartite entanglement in an atomic frequency comb storing a single photon in a Dicke state spread over a macroscopic ensemble.