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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.7: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Perspectives of microwave quantum key distribution — •Florian Fesquet^1,2, Fabian Kronowetter^1,2,4, Michael Renger^1,2, Kedar Honasoge^1,2, Yuki Nojiri^1,2, Maria-Teresa Handschuh^1,2, Achim Marx^1,2, Rudolf Gross^1,2,3, and Kirill. G. Fedorov^1,2 — 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