Manipulating single-photon transport in a waveguide-QED structure containing two giant atoms

TL;DR

This paper analyzes how two giant atoms in a waveguide-QED setup influence single-photon transport, revealing conditions for Fano and EIT-like spectra that can be used for quantum network control.

Contribution

It provides unified analytical expressions for single-photon scattering in various configurations of two giant atoms, advancing understanding of photon control in quantum networks.

Findings

Fano line shapes depend on phase delays and system topology.

Conditions for EIT-like spectra are derived and verified.

Spectroscopic features are detailed across parameter regimes.

Abstract

We investigate coherent single-photon transport in a waveguide-QED structure containing two giant atoms. The unified analytical expressions of the single-photon scattering amplitudes applicable for different topological configurations are derived. The spectroscopic characteristics in different parameter regimes, especially the asymmetric Fano line shapes and the electromagnetically induced transparency (EIT)-like spectra, are analyzed in detail. Specifically, we find that the appearance of Fano line shapes is influenced by not only the phase delays between coupling points but also the topologies of system. We also summarize the general conditions for appearance of EIT-like spectra by analyzing the master equation and verify these conditions by checking the corresponding analytical expressions of the scattering spectra. These phenomena may provide powerful tools for controlling and manipulating photon transport in future quantum networks.