Our work realizing a single-photon absorber was published in PRL and is featured as an editor's suggestion!
If you are interested how we saturate a dense atomic sample with one photon and make it transparent for up to 35 subsequent
photons, please take a read.
C. Tresp, C. Zimmer, I. Mirgorodskiy, H. Gorniaczyk, A. Paris-Mandoki, & S. Hofferberth,
Single-Photon Absorber Based on Strongly Interacting Rydberg Atoms,
Phys. Rev. Lett. 117, 223001 (2016)