Title: "Spectral-multiplexed entangled photon pairs for quantum information science."
Entanglement, the correlations displayed between sub-systems of a multipartite quantum system, is one of the most distinctive properties of quantum physics and a significant resource for quantum information science and technology. Entanglement swapping is a protocol that enables the entanglement of quantum systems that have never interacted. This protocol underpins efforts to realize large-scale quantum networks as the core element of quantum repeaters. Entanglement swapping between entangled photons has been experimentally demonstrated using photons entangled in their polarization, spatial, and temporal degrees of freedom. Here, Dr. Smith focuses on encoding information in the spectral-temporal mode of single photons. This allows for a multiplexed approach to entanglement swapping that can generate many different entangled two-photon states. The entanglement swapping protocol relies on multimode entangled photon-pair sources and the ability to perform spectrally-resolved single-photon detection. Experimental results demonstrating the generation of 5 nearly-orthogonal two-photon states are presented and he outlines future applications that utilize such spectral and temporal multiplexing.