Collection
AI Agents in Security & Governance
Updated 5mo
Research on autonomous AI agents applied to security, forensics, and the governance questions they raise. Focus on the cat-and-mouse dynamics between offensive and defensive AI.
Collection
Updated 5mo
Research on autonomous AI agents applied to security, forensics, and the governance questions they raise. Focus on the cat-and-mouse dynamics between offensive and defensive AI.
Single photon isolation and nonreciprocal frequency conversion in atom-waveguide systems
In this work, we utilize a two-level atom and a $Λ$-type atom to link two identical waveguides, subsequently extending the model to a giant-atom configuration. Our analytical solutions and numerical simulations demonstrate that this setup can achieve single-photon isolation and nonreciprocal frequency conversion by tuning the atom-waveguide coupling strengths $g_i$, respectively. We also examine single-photon scattering in the giant-atom model within both the Markovian and non-Markovian regimes. The results reveal that ultranarrow scattering windows are induced by the phases $φ_1$ and $φ_2$ under specific conditions, making them well-suited for precise frequency conversion and sensing. Additionally, in the non-Markovian regime, the spectra exhibit irregular polygonal shapes, offering enhanced opportunities for exploring nonreciprocal frequency conversion in the off-resonant regime. Our work provides a new perspective on achieving optical nonreciprocity at the single-photon level in atom-waveguide systems.
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