Emergent Oscillating bound states in a semi-infinite linear waveguide with a point-like $\Lambda$-type quantum emitter driven by a classical field

TL;DR

This paper demonstrates the emergence of oscillating bound states in a semi-infinite waveguide coupled to a point-like b1-type quantum emitter driven by a classical field, expanding the understanding of such phenomena beyond giant atoms.

Contribution

It introduces a new waveguide QED system where oscillating bound states occur with a point-like emitter, not just giant atoms, driven by a classical field.

Findings

Oscillating bound states can form in semi-infinite waveguides with point-like emitters.

The phenomenon is driven by a b1-type quantum emitter with classical field control.

This expands the understanding of bound states in continuum in waveguide QED systems.

Abstract

An oscillating bound state is a phenomenon where excitations mediated by the continuum modes oscillate persistently. Although it is generated by the superposition of two bound states in the continuum (BICs), such phenomenon is said to be unique to giant atoms. We present the phenomenon of an oscillating bound state with an alternative waveguide QED system, which is a one-dimensional semi-infinite waveguide coupled to a \textit{point-like} quantum emitter. This \textit{point-like} quantum emitter is $\Lambda$-type quantum system with one transition driven by a classical field.