Regensburg 2022 – scientific programme
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QI: Fachverband Quanteninformation
QI 4: Poster: Quantum Information
QI 4.7: Poster
Monday, September 5, 2022, 18:00–20:00, P2
Perspectives of microwave quantum key distribution — •Florian Fesquet1,2, Fabian Kronowetter1,2,4, Michael Renger1,2, Kedar Honasoge1,2, Yuki Nojiri1,2, Maria-Teresa Handschuh1,2, Achim Marx1,2, Rudolf Gross1,2,3, and Kirill. G. Fedorov1,2 — 1Walther- Meißner-Institut, 85748 Garching, Germany — 2Physik-Department, TUM, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany — 4Rohde & Schwarz GmbH, 81671 Munich, Germany
One of the cornerstones of quantum communication is an unconditionally secure distribution of classical keys between remote parties. This can be achieved by exploiting quantum features of electromagnetic waves, such as entanglement or the no-cloning theorem. However, these quantum resources are known to be susceptible to noise and losses, which are omnipresent in open-air communication scenarios. Here, we theoretically investigate the perspectives of continuous-variable open-air quantum key distribution (QKD) at microwave frequencies. We demonstrate that continuous-variable QKD with propagating microwaves can be unconditionally secure at room temperatures at distances up to 200 meters. Furthermore, we show that microwave QKD provides the potential to outperform conventional QKD protocols at telecom wavelengths for certain weather conditions