Freiburg 2019 – wissenschaftliches Programm
FM 84.18: Poster
Donnerstag, 26. September 2019, 16:30–18:30, Tents
Single-photon source design for quantum telecommunication networks — •Nico Sieber1,2, Matthias Bayerbach1,2, and Stefanie Barz1,2 — 1Center for Integrated Quantum Science and Technology — 2Institute for Functional Matter and Quantum Technologies
Photonic devices are key to a large range of quantum technologies, for example quantum communication and wider quantum networks. When transmitting quantum information over long distances, minimizing losses is crucial to any quantum protocols. Thus, the favourable wavelength is in the telecom regime (1550nm). Many quantum protocols thus rely on pure and indistinguishable photons at this wavelength. Here, we demonstrate the generation of single photons at telecom wavelength using type II spontaneous parametric down-conversion (SPDC) in periodically-poled potassium titanyl phosphate (ppKTP) crystals. When being used in quantum network tasks, the probabilistic nature of SPDC fosters the occurrence of multi-photon pair generation leading to reduced fidelities of the tasks to be implemented. Following that, we perform a simulation of this effect on a variety of quantum network tasks.