Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
TT 38.7: Vortrag
Mittwoch, 22. März 2017, 11:00–11:15, HSZ 03
Impact of noise on entanglement of two-mode squeezed microwave states — •S. Pogorzalek1,2, K. G. Fedorov1,2, P. Yard1,2, P. Eder1,2,3, M. Fischer1,2,3, J. Goetz1,2, E. Xie1,2,3, A. Marx1, F. Deppe1,2,3, and R. 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
Propagating quantum signals in the form of microwave two-mode squeezed states (TMSSs) can be generated by utilizing Josephson parametric amplifiers (JPAs). In our experiments, we employ two flux-driven JPAs at the inputs of an entangling hybrid ring in order to generate TMSSs between the hybrid ring outputs. This allows us to generate quantum entangled propagating microwave signals suitable for quantum communication and sensing applications such as quantum teleportation and quantum radar. However, the performance of these schemes may drastically depend on the amount of environmental noise in the communication channels. We study this dependence experimentally by controlling the amount of excess noise in different parts of the setup. Finally, we investigate the robustness of entanglement to thermal and shot noise via a negativity criterion and determine fundamental negativity-versus-noise limits.
The authors acknowledge support from DFG through FE 1564/1-1, the doctorate program ExQM of the Elite Network of Bavaria, and the IMPRS ‘Quantum Science and Technology’.