Title | Single-photon bound states in atomic ensembles |

Publication Type | Journal Article |

Year of Publication | 2018 |

Authors | Wang, 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. |

URL | https://arxiv.org/abs/1809.01147 |