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This study utilizes tensor-network methods to reveal how finite time delays in waveguide quantum electrodynamics transform superradiant bursts into structured trains of correlated photons. By demonstrating that these non-Markovian dynamics can generate significant emitter-emitter entanglement and exceed standard decay rates, the research advances our understanding of fundamental quantum light-matter interactions.
Superradiant decay in non-Markovian Waveguide Quantum Electrodynamics
arXiv:2511.22332v3 Announce Type: replace Abstract: An array of initially excited emitters coupled to a one-dimensional waveguide exhibits superradiant decay under the Born-Markov approximation, manifested as a coherent burst of photons in the output field. In this work, we employ tensor-network methods to investigate its non-Markovian dynamics induced by finite time delays in photon exchange among the emitters. We find that the superradiant burst breaks into a structured train of correlated photons, each intensity peak corresponding to a specific photon number. We quantify the emitter-photon and emitter-emitter entanglement generated during this process and show that the latter emerges in the long-time limit, as part of the excitation becomes trapped within the emitters' singlet subspace. We finally consider the decay of the system's most radiant state, the symmetric Dicke state, and show that time delay can lead to decay rates exceeding those predicted by the Markovian approximation.
Abstract:An array of initially excited emitters coupled to a one-dimensional waveguide exhibits superradiant decay under the Born-Markov approximation, manifested as a coherent burst of photons in the output field. In this work, we employ tensor-network methods to investigate its non-Markovian dynamics induced by finite time delays in photon exchange among the emitters. We find that the superradiant burst breaks into a structured train of correlated photons, each intensity peak corresponding to a specific photon number. We quantify the emitter-photon and emitter-emitter entanglement generated during this process and show that the latter emerges in the long-time limit, as part of the excitation becomes trapped within the emitters' singlet subspace. We finally consider the decay of the system's most radiant state, the symmetric Dicke state, and show that time delay can lead to decay rates exceeding those predicted by the Markovian approximation.
38 pages, 9 figures. Accepted for publication in Communications Physics
Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Atomic Physics (physics.atom-ph); Computational Physics (physics.comp-ph)
arXiv:2511.22332 [quant-ph]
(or arXiv:2511.22332v3 [quant-ph] for this version)
https://doi.org/10.1038/s42005-026-02722-4 DOI(s) linking to related resources
Full text under the publisher's open licence · 178 words
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