Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Quantum Coherence and Quantum Information Systems (joint session TT/DY)
DY 12.8: Vortrag
Dienstag, 18. März 2025, 11:45–12:00, H31
Secure squeezed state microwave quantum communication with spin ensembles (part 1) — •Florian Fesquet1,2, Patricia Oehrl1,2, Kedar E. Honasoge1,2, Maria-Teresa Handschuh1,2, Achim Marx1, Rudolf Gross1,2,3, Hans Huebl1,2,3, and Kirill G. Fedorov1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
Quantum key distribution (QKD) holds the promise of delivering unconditionally secure distribution of classical keys between remote parties. So far, its implementation in the microwave regime, which is frequency-compatible with superconducting quantum circuits, has been missing. Here, we present the realization of a continuous-variable QKD protocol using propagating squeezed microwave states and demonstrate a finite-size security. In order to store these states for quantum memory applications, we investigate a scheme based on the excitation of high-coherence spin ensembles by microwave quantum signals. Here, we focus on a phosphorus donor electron spin ensemble hosted in isotopically engineered silicon. Our measurements indicate a successful coupling of microwave squeezed states to the spin ensemble with an estimated efficiency of 36%.
Keywords: Secure quantum communication; Squeezed states; Spin ensemble; Quantum state storage; Quantum Sensing