Controlling photons by phonons via giant atom in a waveguide QED setup

TL;DR

This paper explores how phonons can control photon transport in a waveguide QED system with a giant atom, revealing interference effects and tunable transmission properties for potential quantum applications.

Contribution

It introduces a hybrid phonon-photon system with a giant atom that nonlocally interacts with a waveguide, demonstrating phonon-controlled photon transport and effective dispersive coupling effects.

Findings

Phonons modulate the width of the photon transmission window.

Interference effects enable control over photon transport.

Large detuning leads to a single Rabi splitting peak, indicating dispersive coupling.

Abstract

We investigate the single photon scattering in a phonon-photon hybrid system in the waveguide QED scheme. In our consideration, an artificial giant atom, which is dressed by the phonons in a surface acoustic wave resonator, interacts with a coupled resonator waveguide (CRW) nonlocally via two connecting sites. Together with the interference effect by the nonlocal coupling, the phonon serves as a controller to the transport of the photon in the waveguide. On the one hand, the coupling strength between the giant atom and the surface acoustic wave resonator modulates the width of the transmission valley or window in the near resonant regime. On the other hand, the two reflective peaks induced by the Rabi splitting degrade into a single one when the giant atom is large detuned from the surface acoustic resonator, which implies an effective dispersive coupling. Our study paves the way for the potential application of giant atoms in the hybrid system.