Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 33: Quantum Networks: Concepts & Applications

FM 33.1: Invited Talk

Dienstag, 24. September 2019, 14:00–14:30, 1015

Quantum Networking, fully connected and international — •Rupert Ursin — Institute for Quantum Optics and Quantum Information - Vienna, Austrian Academy of Sciences, Austria

Quantum communication is most advanced under the quantum technologies discussed in the scientific literature, such as quantum computing and quantum sensing. One challenge of Quantum Key Distribution (QKD) is how to spread that intrinsic point-to-point protocol to the public users in a scalable manner. I will present a proof-of-principle experiment spreading the quantum information to four users in a novel network architecture which enables scalable quantum communication based on polarisation-entangled photon pairs at telecommunications wavelength [1]. Our scheme uses frequency multiplexing to share 6 two-photon entangled states between each pair of clients in a mesh-like network topology using only one fiber per client.

Furthermore I will present our efforts to use a satellite to distribute quantum information also on an international scale [2]. The mission of the Chinese Academy of Sciences into space will be described and the experiment we did with the Chinese satellite will be presented in my talk.

[1] S. Wengerowsky, et al., Nature, 564(7735), (2018).

[2] SS.-K. Liao et al., Phys. Rev. Lett., 120:030501, (2018).