Single photon isolation and nonreciprocal frequency conversion in atom-waveguide systems
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arXiv
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2025
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| author | Zheng, Jun-Cong Zheng, Xiao-Wei Hei, Xin-Lei Qiao, Yi-Fan Yao, Xiao-Yu Pan, Xue-Feng Ren, Yu-Meng Huo, Xiao-Wen Li, Peng-Bo |
| author_facet | Zheng, Jun-Cong Zheng, Xiao-Wei Hei, Xin-Lei Qiao, Yi-Fan Yao, Xiao-Yu Pan, Xue-Feng Ren, Yu-Meng Huo, Xiao-Wen Li, Peng-Bo |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_15214 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single photon isolation and nonreciprocal frequency conversion in atom-waveguide systems Zheng, Jun-Cong Zheng, Xiao-Wei Hei, Xin-Lei Qiao, Yi-Fan Yao, Xiao-Yu Pan, Xue-Feng Ren, Yu-Meng Huo, Xiao-Wen Li, Peng-Bo Quantum Physics 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. |
| title | Single photon isolation and nonreciprocal frequency conversion in atom-waveguide systems |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.15214 |