Many Body Physics with Coupled Transmission Line Resonators

TL;DR

This paper introduces a superconducting transmission line resonator with Josephson junctions operating at few-photon levels, enabling exploration of quantum many-body physics with strong nonlinearities comparable to qubits.

Contribution

It derives eigenmode properties and nonlinearities of a novel Josephson junction-based resonator suitable for studying strongly correlated quantum systems.

Findings

Nonlinearities comparable to Transmon qubits.

Eigenmode frequencies and zero point fluctuations derived.

Potential for investigating quantum many-body dynamics.

Abstract

We present the Josephson junction intersected superconducting transmission line resonator. In contrast to the Josephson parametric amplifier, Josephson bifurcation amplifier and Josephson parametric converter we consider the regime of few microwave photons. We review the derivation of eigenmode frequencies and zero point fluctuations of the nonlinear transmission line resonator and the derivation of the eigenmode Kerr nonlinearities. Remarkably these nonlinearities can reach values comparable to Transmon qubits rendering the device ideal for accessing the strongly correlated regime. This is particularly interesting for investigation of quantum many-body dynamics of interacting particles under the influence of drive and dissipation. We provide current profiles for the device modes and investigate the coupling between resonators in a network of nonlinear transmission line resonators.