Finite-size corrections in the Kitagawa-Ueda collective spin model with χ = 2g/(N-1) produce a Gaussian-dephased, nonlinear single-qubit channel with decoherence time t_φ ∝ √N, accurately captured by a time-local dephasing master equation.
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Emergent Non-Markovian Nonlinear Qubit From Collective Spin Interactions
Finite-size corrections in the Kitagawa-Ueda collective spin model with χ = 2g/(N-1) produce a Gaussian-dephased, nonlinear single-qubit channel with decoherence time t_φ ∝ √N, accurately captured by a time-local dephasing master equation.