Abstract: We consider the quantum electrodynamics of a system of two-level atoms. We show that it is possible to uniquely determine the density of atoms from measurements of the source to solution map for a system of nonlocal partial differential equations, which describe the scattering of a two-photon state from the atoms. The required measurements involve correlating the outputs of a point detector with an integrating detector, thereby exploiting information about the entanglement of the photons.

About the speaker: John C. Schotland is the Zhao and Ji Professor of Mathematics at Yale University. His research interests are in mathematical physics. He received the M.D. and Ph.D. degrees from the University of Pennsylvania.