# Kerr-free three-wave mixing in superconducting quantum circuits

## TL;DR

This paper demonstrates a method to achieve Kerr-free three-wave mixing in superconducting circuits using a SNAIL, significantly enhancing the dynamic range of quantum amplifiers by reducing signal-induced detuning.

## Contribution

The authors introduce a flux and pump tuning technique to operate a SNAIL-based amplifier at a Kerr-free point, increasing photon processing capacity.

## Key findings

- 10-fold increase in photon processing capacity
- Successful in situ Kerr-free operation
- Method applicable to other quantum circuits

## Abstract

Quantum-limited Josephson parametric amplifiers are crucial components in circuit QED readout chains. The dynamic range of state-of-the-art parametric amplifiers is limited by signal-induced Stark shifts that detune the amplifier from its operating point. Using a Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) as an active component, we show the ability to in situ tune the device flux and pump to a dressed Kerr-free operating point, which provides a 10-fold increase in the number of photons that can be processed by our amplifier, compared to the nominal working point. Our proposed and experimentally verified methodology of Kerr-free three-wave mixing can be extended to improve the dynamic range of other pumped operations in quantum superconducting circuits.