It is claimed that DCQE is equivalent to a single-photon double-slit setup. However, In this experiment, the 351.1nm Argon ion pump laser beam is divided by a double-slit, which means the actual photon rate is 1013 times higher than in a single-photon setup. Consequently, it makes it possible for both A and B regions to generate photon pairs simultaneously enough to allow corresponding photons from different pairs to interfere further in the set. I believe that the interpair interference explains the experimental results. If this hasn’t been discussed yet, I’d like to develop this idea step by step, so please comment.