Fig. 4
From: Establishing and storing of deterministic quantum entanglement among three distant atomic ensembles
The dependence of combination of normalized quantum correlation variances among three atomic ensembles after a storage time of 1000 ns on the squeezing parameter r of three DOPAs and the mapping efficiency η M, where the gains are taken as the optimal gain \(g_{{\rm{A1}} - {\rm{A3}}}^{{\rm{opt}}}\)
