Strongly Confined Atomic Excitation Localization in a Weakly-Driven Atom-Waveguide Interface

Abstract

An atomic array coupled to a photonic crystal waveguide forms a strongly coupled quantum interface, exhibiting various intriguing collective features of quantum dynamics. Here we consider a homogeneous atomic array and theoretically investigate its steady-state distribution when the incident fields drive the atoms from both sides at asymmetric angles. This effectively creates an interface shared by two zones of atoms under different driving angles. This setup introduces a competition between photon-mediated dipole-dipole interactions and the directionality of coupling, while differences of the travelling phases from the incident angles further influence the overall steady-state behavior. Under this asymmetric driving scheme, the presence of strongly confined localization can be identified, where localization can occur either at the interface or at one of edges. Additionally, we examine the size effect on the atomic localization, deriving an empirical formula to predict parameter regimes that favor interfaced localization. We also consider a defect-driving scheme, where a third zone is created by undriven atoms under symmetric travelling phases. This results in strongly confined single-site excitation localization, which can be explained through analytical solutions under the reciprocal coupling. Finally, we propose several methods for precise control of multiple single-site localizations under the defect-driving scheme. Our results provide insights into driven-dissipative quantum systems with nonreciprocal couplings and pave the way for quantum simulation of exotic many-body states relevant to quantum information applications.

8 figures

References in corpus (20)

• Chiral Quantum Optics
• Single-Photon Switching and Entanglement of Solid-State Qubits in an Integrated Nanophotonic System
• Quantum Optics of Chiral Spin Networks
• Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains
• Mesoscopic Entanglement Induced by Spontaneous Emission in Solid-State Quantum Optics
• Cavity QED on a nanofiber using a composite photonic crystal cavity
• Storage of fiber-guided light in a nanofiber-trapped ensemble of cold atoms
• Entanglement transport and a nanophotonic interface for atoms in optical tweezers
• Signatures of bath-induced quantum avalanches in a many-body--localized system
• Many-body localization in waveguide QED
• Collective radiative dynamics of an ensemble of cold atoms coupled to an optical waveguide
• Many-body superradiance and dynamical mirror symmetry breaking in waveguide QED
• Bound and Subradiant Multi-Atom Excitations in an Atomic Array with Nonreciprocal Couplings
• Self-Ordering of Individual Photons in Waveguide QED and Rydberg-Atom Arrays
• Steady-state Phase Diagram of a Weakly Driven Chiral-coupled Atomic Chain
• Quantum correlations of localized atomic excitations in a disordered atomic chain
• Incomplete spontaneous decay in a waveguide caused by polarization selection
• Driven anti-Bragg subradiant states in waveguide quantum electrodynamics
• Atomic excitation delocalization at the clean to disordered interface in a chirally-coupled atomic array
• Atomic excitation trapping in dissimilar chirally-coupled atomic arrays