Phase-controlled bound states in giant atom waveguide QED setup

TL;DR

This paper demonstrates phase-controlled bound states in a giant atom waveguide QED system, revealing conditions for their existence, their properties, and quantum beats arising from their oscillations, enabling waveguide system manipulation.

Contribution

It introduces phase-controlled bound states in a giant atom waveguide QED setup, detailing their existence conditions, properties, and dynamical behavior, which was not previously explored.

Findings

Existence conditions for BOC and BIC in the system

Frequency and photonic distribution of BIC

Prediction of quantum beats from BIC and BOC oscillations

Abstract

We find the phase-controlled bound state out of the continuum~(BOC) and bound state in the continuum~(BIC) in an artificial giant atom dressed one-dimensional photonic waveguide where the giant atom couples to the waveguide via two distant sites. We obtain the existence condition of the BOC as well as the frequency and the photonic distribution in the BIC. More interestingly, we predict the quantum beats in the atomic and photonic dynamical evolution, which is induced by the oscillation between the BIC and the BOCs. These findings provide an approach to manipulate the waveguide system via the bound states.