Qubit-pair entanglement protection versus induced spectral localization under the influence of an external classical field and effective nonlinearities

M.S. Ateto, Emad K. Jaradat and S.M. Abo-Dahab

Chaos, Solitons & Fractals, 2026, vol. 209, issue P2

Abstract: We propose a scheme for sensing qubit–qubit entanglement through the controlled alignment between the entanglement protection and spectral localization in a Kerr-type nonlinear cavity with intensity-dependent Stark shifts under a classical driving. Importantly, we demonstrate that the classical pump amplitude, Kerr nonlinearity, and Stark shift act cooperatively to reshape the dressed-state structure of the driven cavity-qubit system, such that the bipartite entanglement, Wigner phase-space interference, and atomic spectral response become parallel manifestations of the same underlying light–matter coherence.

Keywords: Entanglement; Spectral localization; Atomic lineshape; Classical driving; Nonlinearity (search for similar items in EconPapers)
Date: 2026
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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:209:y:2026:i:p2:s0960077926005709

DOI: 10.1016/j.chaos.2026.118429

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