Quantum discord is known as a general measure for quantum correlations in bipartite systems. It encompasses all nonclassical correlations including entanglement. Quantum discord has many intriguing fundamental properties many of which require experimental verification such as the asymptotic robustness towards environmental noise. We experimentally investigate quantum discord in propagating two-mode squeezed (TMS) microwave states generated with the help of superconducting Josephson parametric amplifiers. We exploit asymmetric noise injection into these TMS states which allows us to demonstrate the robustness of quantum discord as opposed to the sudden death of entanglement. Finally, we discuss the relevance of quantum discord as a resource in quantum communication and sensing , in particular with respect to remote state preparation and quantum radar protocols.
*We acknowledge support by the German Research Foundation through FE 1564/1-1, Elite Network of Bavaria through the program ExQM, EU Quantum Flagship project QMiCS, and Excellence Cluster MCQST.
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Presenters
Kirill Fedorov
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Authors
Kirill Fedorov
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Stefan Pogorzalek
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Minxing Xu
Walther-Meißner-Institut, Munich, Germany
Michael Renger
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Michael Fischer
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Edwar Xie
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Qi-Ming Chen
Walther-Meißner-Institut, Munich, Germany
Achim Marx
Walther Meissner Institute for Low Temperature Research
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Frank Deppe
Walther Meissner Institute for Low Temperature Research
Walther-Meißner-Institut, Munich, Germany
Walther-Meißner-Institut & Physik-Department, Bayerische Akademie der Wissenschaften & Technische Universität München
Rudolf Gross
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
