Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 76: Poster Session: Transport 2
TT 76.3: Poster
Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1
Entanglement in propagating two-mode squeezed microwave states — •B. Ghaffari1,2, K. G. Fedorov1,2, S. Pogorzalek1,2, 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
Josephson parametric amplifiers (JPAs) can be employed for the generation of itinerant quantum signals in the form of propagating two-mode squeezed states (TMSSs), which are essential for quantum communication protocols. Further applications of TMSSs include quantum information processing with continuous variables, or novel ideas of building quantum annealing networks based on JPAs. All these fields make use of multiple JPAs for entanglement generation and manipulation, and therefore require detailed knowledge of their physical properties. In our experiments, we employ two flux-driven JPAs at the inputs of an entangling hybrid ring in order to generate two-mode squeezing between the hybrid ring outputs. We perform tomography of the resulting TMSSs and experimentally investigate the robustness of the entanglement to noise and finite-time delays.
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’.