Superradiance paradox in waveguide lattices

手性波导 QED 中延迟对多体超辐射的影响

Effects of retardation on many-body superradiance in chiral waveguide QED

本文研究手性波导中原子链的超辐射衰减，通过精确主方程发现集体衰减与延迟竞争导致有效最大原子数和峰值发射率平台，并揭示了超辐射域形成及持续振荡动力学。

Superradiance for atoms trapped along a photonic crystal waveguide

We report observations of superradiance for atoms trapped in the near field of a photonic crystal waveguide (PCW). By fabricating the PCW with a band edge near the D$_1$ transition of atomic cesium, strong interaction is achieved between trapped atoms and guided-mode photons. Following short-pulse excitation, we record the decay of guided-mode emission and find a superradiant emission rate scaling as $\barΓ_{\rm SR}\propto\bar{N}\cdotΓ_{\rm 1D}$ for average atom number $0.19 \lesssim \bar{N} \lesssim 2.6$ atoms, where $Γ_{\rm 1D}/Γ_0 =1.1\pm0.1$ is the peak single-atom radiative decay rate int…

波导量子电动力学中的多体超辐射与动力学镜像对称破缺

Many-body superradiance and dynamical mirror symmetry breaking in waveguide QED

针对扩展二能级系统多体衰变难题，研究一维波导中发射器阵列的Dicke超辐射现象，推导了爆发发生的最小条件，发现类雪崩行为引发镜像对称破缺，为关联光子态生成提供明确证据。

在无序波导量子电动力学中鲁棒的超辐射和自发自旋有序

Robust Superradiance and Spontaneous Spin Ordering in Disordered Waveguide Quantum Electrodynamics

研究发现，在强无序波导中，超辐射现象仍保持鲁棒性，且自旋自发有序优化干涉效应。

Controlling collective spontaneous emission with plasmonic waveguides

We demonstrate a plasmonic route to control the collective spontaneous emission of two-level quantum emitters. Superradiance and subradiance effects are observed over distances comparable to the operating wavelength inside plasmonic nanochannels. These plasmonic waveguides can provide an effective epsilon-near-zero operation in their cut-off frequency and Fabry-Perot resonances at higher frequencies. The related plasmonic resonant modes are found to efficiently enhance the constructive (superradiance) or destructive (subradiance) interference between different quantum emitters located inside t…

Bound state of distant photons in waveguide quantum electrodynamics

Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics. Here we predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box. Paradoxically, two entangled particles become localized at the opposite edges of the box even though their interactions at large distance should seemingly play no role. Such states could be realized in the waveguide quantum electrodynamics platform, where an array of superconducting qubits or cold atoms is coupled to a waveguide. We demonstrate how long-range wavegui…