Quantum communication with semiconductor quantum dots presented by Christian Schimpf

Abstract: Semiconductor quantum dots (QDs) are able to confine single charges on the nanoscale in all three dimensions of space, making them excellent systems for exploring quantum phenomena. In particular, QDs have demonstrated outstanding performance as sources of entangled and indistinguishable photon pairs [1,2], properties highly desired in the fields of quantum communication and -information processing. Here I report on the advances of QDs as potential resources for photonic quantum networks, which allow to overcome the fundamental range limitations of single photon-based applications by distributing entanglement over basically unlimited distances [3]. After an introduction to the underlying mechanisms of entangled photon pair generation, I demonstrate several building blocks of quantum networks, such as quantum teleportation [4], entanglement swapping [5] and quantum key distribution [6], and conclude with a perspective towards a real-life quantum-network based entirely on QDs. [1] D. Huber et al, Nat. Commun. 8, 15506 (2017) [2] L. Schweickert et al., Appl. Phys. Lett. 112, 093106 (2018) [3] H. J. Kimble, Nature 453, 1023-1030 (2008) [4] M. Reindl et al., Sci. Adv. 4, eaau1255 (2018) [5] F. Basso Basset et al, Phys. Rev. Lett. 16, 160501 (2019) [6] C. Schimpf et al., Sci. Adv. 7, eabe8905 (2021)