Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.15: Poster

Monday, September 5, 2022, 18:00–20:00, P2

Entanglement distribution over a cryogenic microwave link — •Simon Gandorfer^1,2, Michael Renger^1,2, Wun Kwan Yam^1,2, Florian Fesquet^1,2, Kedar Honasoge^1,2, Fabian Kronowetter^1,2,3, Yuki Nojiri^1,2, Maria-Teresa Handschuh^1,2, Achim Marx¹, Rudolf Gross^1,2,4, and Kirill G. Fedorov^1,2 — ¹Walther-Meißner-Institut, 85748 Garching, Germany — ²Physik-Department, TUM, 85748 Garching, Germany — ³Rohde & Schwarz GmbH & Co. KG, 81671 Munich, Germany — ⁴Munich Center for Quantum Science and Technology, 80799 Munich, Germany

In the context of rapid progress in quantum technologies, the realization of hardware platforms for quantum communication networks is of utmost importance. Quantum local area networks connecting remote superconducting quantum nodes are crucial for the implementation of distributed quantum computing architectures. In this regard, we demonstrate a 6.5 m cryogenic link connecting two dilution cryostats via a cold network node. The respective microwave quantum communication channel is realized with superconducting microwave coaxial cables cooled to temperatures below 100 mK. By using this system, we demonstrate a successful distribution of squeezed states and two-mode entanglement between the remote dilution fridges and validate robustness of the quantum state transfer up to channel temperatures of 1 K.