Fri, Sep 14, 2018 12:00 pm - 12:45 pm
PSC 2136


Title: Single-photon bound states in atomic ensembles

Speaker: Yidan Wang, JQI

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.

Notes: Lunch served at 12:00 pm, talk at 12:15 pm.

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