Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Superconductivity: Superconducting Electronics I
TT 49.2: Vortrag
Mittwoch, 14. März 2018, 10:00–10:15, H 2053
Design of a non-degenerate parametric amplifier based on two coupled Josephson junction arrays — •Ivan Takmakov1,2, Patrick Winkel1, Luca Planat2, Natalia Maleeva1, Kirill Borisov1, Alexey V. Ustinov1,4, Wolfgang Wernsdorfer1,2,3, Ioan M. Pop1, and Nicolas Roch2 — 1Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Institut Néel, CNRS and Université Joseph Fourier, Grenoble, France — 3Institute for Nanotechnology, Karlsruhe Institute for Technology — 4Russian Quantum Center, National University of Science and Technology MISIS, Moscow, Russia
We present the design of a parametric amplifier which consists of two identical, capacitively coupled Josephson junction array resonators, referred to as Dimer Josephson Junction Array Amplifier (DJJAA). If design parameters are chosen appropriately, the Josephson Junction array resonators exhibit a dispersion relation with a linear regime including several eigenmodes. Due to the shared coupling capacitance between the arrays, their spectra hybridize to symmetric and antisymmetric pairs of modes, with a level splitting up to several hundreds of MHz. By applying a strong pump tone in-between a pair of hybridized modes we predict non-degenerate amplification, with an instantaneous bandwidth up to 50 MHz and a dynamic range well above the single photon regime. By utilizing several eigenmodes of the same system our approach potentially allows to cover a much larger band of operation.