Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 76: Entanglement: Spectroscopy
FM 76.2: Talk
Thursday, September 26, 2019, 14:30–14:45, 1015
Quantum discord in squeezed microwaves — •Kirill G. Fedorov1,2, Stefan Pogorzalek1,2, Michael Renger1,2, Qi-Ming Chen1,2, Matti Partanen1, 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 — 3Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany
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 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).