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    Photon climbing in a Kerr ladder for steady nonclassical light generation

    Jiahua Li* and Yan Liu*,†

    • *These authors contributed equally to this work.
    • †Contact author: neonorth@foxmail.com

    Phys. Rev. A 114, 043731 – Published 20 October, 2026

    DOI: https://doi.org/10.1103/wrwn-df3s

    Abstract

    We propose a dissipative ladder-climbing mechanism in which N incoherently pumped qubits autonomously stabilize the cavity field near the target N-photon cavity Fock state |N〉c. Full Lindblad simulations verify the predicted photon-number climbing and show that Kerr-induced spectral selectivity suppresses off-resonant leakage. We further develop an effective analytical approach that agrees quantitatively with full Lindblad steady-state results in the validated parameter regime and enables extrapolation to larger qubit arrays. The stabilized fields remain strongly sub-Poissonian and retain appreciable Wigner negativity, with radial Wigner-function fringes becoming increasingly pronounced at higher N, suggesting a tunable dissipative route from single-photon generation to large-photon-number Fock-state resources relevant to bosonic quantum information processing and quantum-enhanced metrology.

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