Single-photon scattering by a giant molecule asymmetrically coupled to parallel waveguides
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866909017029214208 |
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| author | Zhang, Ze-Quan Ye, Guang-Zheng Chen, Wei-Xin Li, Yong Wu, Huaizhi |
| author_facet | Zhang, Ze-Quan Ye, Guang-Zheng Chen, Wei-Xin Li, Yong Wu, Huaizhi |
| contents | We investigate single-photon scattering in a waveguide-QED setup, where a giant molecule composed of two frequency-detuned giant atoms is coupled to two parallel waveguides via multiple connection points. The competition between coherent atom--atom coupling and the effective decay rates dictates the splitting of a single resonance into a doublet in the transmission (reflection) spectra. By tailoring the asymmetry of the decay rates and the atomic detuning, one can engineer photon-path interference to optimize the transfer between waveguides; under chiral coupling conditions, this interference can be further harnessed to realize fully deterministic routing. In the non-Markovian regime, retardation effects can reshape the spectra and actively drive transitions between the weak- and strong-coupling regimes, converting an unsplit Markovian resonance into a clearly separated doublet, or conversely merging a split doublet back into a single resonance. For sufficiently long time delays, it further generates multiple resonances and avoided crossings, enriching the spectral response. Our results demonstrate how atomic detuning, decay-rate asymmetry, and non-Markovian retardation cooperate to provide versatile, interference-based control over single-photon routing in multi-port quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_04588 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Single-photon scattering by a giant molecule asymmetrically coupled to parallel waveguides Zhang, Ze-Quan Ye, Guang-Zheng Chen, Wei-Xin Li, Yong Wu, Huaizhi Quantum Physics We investigate single-photon scattering in a waveguide-QED setup, where a giant molecule composed of two frequency-detuned giant atoms is coupled to two parallel waveguides via multiple connection points. The competition between coherent atom--atom coupling and the effective decay rates dictates the splitting of a single resonance into a doublet in the transmission (reflection) spectra. By tailoring the asymmetry of the decay rates and the atomic detuning, one can engineer photon-path interference to optimize the transfer between waveguides; under chiral coupling conditions, this interference can be further harnessed to realize fully deterministic routing. In the non-Markovian regime, retardation effects can reshape the spectra and actively drive transitions between the weak- and strong-coupling regimes, converting an unsplit Markovian resonance into a clearly separated doublet, or conversely merging a split doublet back into a single resonance. For sufficiently long time delays, it further generates multiple resonances and avoided crossings, enriching the spectral response. Our results demonstrate how atomic detuning, decay-rate asymmetry, and non-Markovian retardation cooperate to provide versatile, interference-based control over single-photon routing in multi-port quantum networks. |
| title | Single-photon scattering by a giant molecule asymmetrically coupled to parallel waveguides |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.04588 |