Single-photon bound states in atomic ensembles

TitleSingle-photon bound states in atomic ensembles
Publication TypeJournal Article
Year of Publication2018
AuthorsWang, Y, Gullans, MJ, Browaeys, A, Porto, JV, Chang, DE, Gorshkov, AV
Abstract

We illustrate the existence of single-excitation bound states for propagating photons interacting with N two-level atoms. These bound states can be calculated from an effective spin model, and their existence relies on dissipation in the system. The appearance of these bound states is in a one-to-one correspondence with zeros in the single-photon transmission and with divergent bunching in the second-order photon-photon correlation function. We also formulate a dissipative version of Levinson's theorem for this system by looking at the relation between the number of bound states and the winding number of the transmission phases. This theorem allows a direct experimental measurement of the number of bound states using the measured transmission phases.

URLhttps://arxiv.org/abs/1809.01147