Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Superconductivity: Superconducting Electronics I

TT 49.1: Hauptvortrag

Mittwoch, 14. März 2018, 09:30–10:00, H 2053

Parametric Amplification in Josephson Circuits with Non-Centrosymmetric Nonlinearity — •Alexander Zorin, Marat Khabipov, Judith Felgner, and Ralf Dolata — Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany

The superconducting technology enabling passive components with extremely low losses and Josephson elements with large nonlinearity makes it possible to engineer various networks possessing remarkable properties for propagating microwaves. We show that nonlinearity of the transmission line based on one-dimensional array of inductively-shunted Josephson junctions, i.e. serially connected rf-SQUIDs, can be effectively controlled by external magnetic flux with crossover from Kerr-like (centrosymmetric) nonlinearity to the pure χ⁽²⁾-type, i.e. non-centrosymmetric nonlinearity [1]. The later property, much like in quantum optics with materials having broken inversion symmetry, gives rise to the important effects including second harmonic generation, sum and difference frequency generation, and parametric amplification of microwave light. Due to excellent phase matching, which is possible in this transmission line in a wide frequency range, large parametric gain of traveling microwaves with ultimately quantum-limited performance can be achieved. Recent experiments performed with Nb trilayer circuits [2] have confirmed the validity of our concept and shown great promise for operation in the single-photon regime.
A. B. Zorin, Phys. Rev. Applied 6, 034006 (2016).
A. B. Zorin, M. Khabipov, J. Dietel, R. Dolata, arXiv:1705.02859.