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# Single-photon bound states in atomic ensembles

preprint

posted on 2023-11-30, 06:15 authored by Yidan Wang, Michael J. Gullans, Antoine Browaeys, J. V. Porto, Darrick E. Chang, Alexey V. GorshkovWe 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.