Figure 2: Anti-bunching parameter and cross-correlation function 
without storage in site B.
without storage in site B.From: Storing single photons emitted by a quantum memory on a highly excited Rydberg state
(a) Anti-bunching parameter α measured before site B and (b) cross-correlation function 
measured after site B without loading the atomic ensemble. Data are taken at tA∼1 μs. For low p(w) high-quality heralded single photon in the read mode as well as non-classical correlations are created, beating the classical bounds (indicated by the dashed line). The solid lines are fits with a model described in Supplementary Note 2. The error bars are the propagated Poissonian error of the photon counting probabilities.
