Related papers: Bound, antibound and resonance two-photon states in chiral waveguide QED

Bound, antibound and resonance two-photon states in chiral waveguide QED

URL: http://arxiv.org/abs/2604.20602v1
Date: Wed, 22 Apr 2026 14:19:46 GMT
Title: Bound, antibound and resonance two-photon states in chiral waveguide QED
Abstract summary: We present a theoretical study of the two-particle spectrum $(K)$ for the chiral waveguide QED setup.<n>For each pair center-of-mass momentum $K$ there exist distinct solutions with $Imle 0$ in the two-particle spectrum.<n>An interesting finding is that the real part of the spectrum $Re (K)$ in the chiral model is gapless.
Score: 51.56484100374058
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We present a theoretical study of the two-particle spectrum $ω(K)$ for the chiral waveguide QED setup of an array of two-level atoms directionally interacting with photons propagating along the waveguide. We demonstrate that for each pair center-of-mass momentum $K$ there exist distinct solutions with $\Imω\le 0$ in the two-particle spectrum, corresponding to bound, antibound and resonance states, in addition to the continuum of scattering states. Contrary to previous studies, which showed the bound and resonance-state spectra only over a limited range of $K$, the calculated spectrum is consistent across all $K$ values. An interesting finding is that the real part of the spectrum $\Re ω(K)$ in the chiral model is gapless.

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