Engineering the nonlinearity of a SNAIL parametric amplifier for higher dynamic range: part 1

ORAL

Abstract

Quantum-limited Josephson parametric amplifiers are an important component for most superconducting qubit readout methods. Although the basic theoretical model that describes such amplifiers is very general, the exact physical realization may rely on using different types of nonlinearity for mixing. Pure three-wave mixing amplifiers use 3rd order nonlinearity for the mixing leading to amplification, while keeping away harmful 4th order Kerr nonlinearity that limits the dynamic range of the amplifier. We present a degenerate amplifier based on an array of SNAILs (Superconducting Nonlinear Asymmetric Inductive Elements), in which the 3rd and 4th order nonlinearities can be separately adjusted in order to optimize the amplifier performance. In particular, this SNAIL parametric amplifier can be flux-tuned to a Kerr-free point while still possessing third order nonlinearity. In part 1, we will present results of direct measurement of Kerr nonlinearity and indirect measurement of 3rd order nonlinearity.

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Presenters

  • Nicholas Frattini

    Applied Physics, Yale University, Physics and Applied Physics, Yale University

Authors

  • Nicholas Frattini

    Applied Physics, Yale University, Physics and Applied Physics, Yale University

  • Volodymyr Sivak

    Applied Physics, Yale University

  • Andrew Lingenfelter

    Applied Physics, Yale University

  • Shyam Shankar

    Applied Physics, Yale University, Department of Applied Physics, Yale University, Department of Applied Physics, Yale Univ, Yale Univ

  • Michel Devoret

    Yale University, Applied Physics, Yale University, Department of Applied Physics, Yale University, Applied Physics, Yale Univ, Physics and Applied Physics, Yale University, Yale Univ, Dept. of Applied Physics, Yale University, Department of Applied Physics, Yale Univ