Engineering the Environment of a Superconducting Qubit with an Artificial Giant Atom

TL;DR

This paper introduces an architecture using an artificial giant atom to control the environment of a superconducting qubit, significantly enhancing qubit lifetime and readout fidelity in quantum computing.

Contribution

It demonstrates a novel frequency-tunable giant atom that improves qubit-environment interaction control, surpassing the Purcell limit and extending qubit lifetime tenfold.

Findings

Extended qubit lifetime by ten times

Achieved high-fidelity readout while maintaining speed

Surpassed the Purcell limit in qubit decay control

Abstract

In quantum computing, precise control of system-environment coupling is essential for high-fidelity gates, measurements, and networking. We present an architecture that employs an artificial giant atom from waveguide quantum electrodynamics to tailor the interaction between a superconducting qubit and its environment. This frequency-tunable giant atom exhibits both frequency and power selectivity for photons: when resonant with the qubit, it reflects single photons emitted from the qubit while remaining transparent to strong microwave signals for readout and control. This approach surpasses the Purcell limit and significantly extends the qubit's lifetime by ten times while maintaining the readout speed, thereby improving both gate operations and readout. Our architecture holds promise for bridging circuit and waveguide quantum electrodynamics systems in quantum technology applications.