Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.50: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Entropic measures in propagating quantum microwaves — •Robert Neagu1,2, Kirill G. Fedorov1,2, Stefan Pogorzalek1,2, Qi-Ming Chen1,2, Michael Fischer1,2,3, Michael Renger1,2, Edwar Xie1,2,3, Achim Marx1, Frank Deppe1,2,3, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, Germany
Classical information theory is a useful tool to describe the communication, storage, and processing of classical information by exploiting the Shannon entropy. In quantum information theory, similar tasks can be achieved for quantum system by utilizing the von Neumann entropy. Furthermore, quantum correlations lead to additional intriguing effects which can be utilized in various protocols. We experimentally investigate two-mode squeezed (TMS) microwave states as a source of such nonclassical correlations and characterize the latter in terms of different entropic measures. Additionally, we realize a fundamental quantum communication protocol by employing the TMS states and a feedforward. Finally, we relate this quantum communication protocol to an extension of the one-time pad to the quantum regime and investigate the security of the protocol using entropic measures.
We acknowledge support by the German Research Foundation through FE 1564/1-1 and the Excellence Cluster MCQST, the Elite Network of Bavaria through the program ExQM, and the European Union via the Quantum Flagship project QMiCS (Grant No 820505).