Multimode circuit QED with hybrid metamaterial transmission lines

TL;DR

This paper introduces a hybrid transmission line combining left-handed and right-handed metamaterials for circuit QED, enabling multi-mode ultra-strong coupling and applications in quantum state preparation and simulation.

Contribution

It presents a novel hybrid metamaterial transmission line design that enhances circuit QED capabilities in the quantum regime.

Findings

Achieved multi-mode ultra-strong coupling in circuit QED.

Demonstrated potential for multipartite entangled state preparation.

Showed use as a quantum simulator for the spin-boson model.

Abstract

Quantum transmission lines are a central to superconducting and hybrid quantum computing. Parallel to these developments are those of left-handed meta-materials. They have a wide variety of applications in photonics from the microwave to the visible range such as invisibility cloaks and perfect flat lenses. For classical guided microwaves, left-handed transmission lines have been proposed and studied on the macroscopic scale. We combine these ideas in presenting a left-handed/right-handed hybrid transmission line for applications in quantum optics on a chip. The resulting system allows circuit QED to reach a new regime: multi-mode ultra-strong coupling. Out of the many potential applications of this novel device, we discuss two; the preparation of multipartite entangled states and its use as a quantum simulator for the spin-boson model where a quantum phase transition is reached up to finite size-effects.