Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 2

TT 48.1: Vortrag

Mittwoch, 22. März 2017, 15:00–15:15, HSZ 201

Josephson parametric amplifier with mixing of three traveling waves — •Alexander B. Zorin, Judith Dietel, Ralf Dolata, and Marat Khabipov — Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany

Due to accessible quantum-limited performance Josephson parametric amplifiers are important tools in quantum information technology and the traveling-wave Josephson parametric amplifiers with inherently large bandwidth are especially desired for fast signal processing and frequency multiplexing. So far these devices have required the four-wave mixing condition to operate and special compensation of unavoidable phase mismatch [1,2]. We show, however, that there is an elegant way to realize efficient three-wave mixing at negligible phase mismatch without applying sophisticated dispersion engineering. Our Josephson traveling-wave parametric amplifier is based on a chain of rf-SQUIDs forming a metamaterial transmission line possessing quadratic nonlinearity [3]. It can have large (exponential) gain, wide bandwidth, and ultimately quantum-limited characteristics, outperforming its state-of-the-art four-wave counterparts. Recent experimental data obtained with first Nb circuits at temperature T = 4.2 K will also be reported.

[1] T. C. White et al., Appl. Phys. Lett. 106, 242601 (2015).

[2] C. Macklin et al., Science 350, 307 (2015).

[3] A. B. Zorin, Phys. Rev. Applied 6, 034006 (2016).