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PreprintarXiv licencearXiv

Ground-State Dressing and Delayed Feedback of a Chiral Giant Atom in Ultrastrong Waveguide QED

  • Giuseppe Musolino
  • Daniele Lamberto
  • Salvatore Savasta
  • Federico Roccati
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Abstract

We study a chiral giant atom ultrastrongly coupled to a one-dimensional waveguide at two spatially separated points. At a relative coupling phase π/2, the total spectral density is independent of the distance between the coupling points, whereas its directional components are not. Using a variational polaron transformation, we show that the renormalized transition frequency and the total ground-state dressing inherit this independence, while the virtual-photon cloud remains chiral. A sudden switch-off of the coupling releases this cloud as directional radiation. We also derive the spontaneous-emission dynamics in the polaron frame, showing that, after neglecting the local photonic potential, the memory kernel becomes distance independent at the same phase.

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Cite

BibTeXRIS
BibTeX
@misc{musolino2026groundstate,
  title = {{Ground-State Dressing and Delayed Feedback of a Chiral Giant Atom in Ultrastrong Waveguide QED}},
  author = {Giuseppe Musolino and Daniele Lamberto and Salvatore Savasta and Federico Roccati},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07036},
  eprint = {2611.07036},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07036},
}
RIS
TY  - UNPB
TI  - Ground-State Dressing and Delayed Feedback of a Chiral Giant Atom in Ultrastrong Waveguide QED
AU  - Giuseppe Musolino
AU  - Daniele Lamberto
AU  - Salvatore Savasta
AU  - Federico Roccati
PY  - 2026
DA  - 2026/11/04
PB  - arXiv
DO  - 10.48550/arxiv.2611.07036
UR  - https://arxiv.org/abs/2611.07036
AB  - We study a chiral giant atom ultrastrongly coupled to a one-dimensional waveguide at two spatially separated points. At a relative coupling phase π/2, the total spectral density is independent of the distance between the coupling points, whereas its directional components are not. Using a variational polaron transformation, we show that the renormalized transition frequency and the total ground-state dressing inherit this independence, while the virtual-photon cloud remains chiral. A sudden switch-off of the coupling releases this cloud as directional radiation. We also derive the spontaneous-emission dynamics in the polaron frame, showing that, after neglecting the local photonic potential, the memory kernel becomes distance independent at the same phase.
ER  -