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An answer is the functional form of $\\delta_{E}(N)$, testing exponential decay in $N$ at fixed $\\sigma/t$ ($t$ the inter-dot hopping).","problem_ref":null,"references":"","settled_by":"Spectroscopy and parity-readout coherence measurements on chains with $N = 2 \\text{ to at least } 5$.","status_note":"Two- and three-site chains (2023-2025), single-shot parity readout of a minimal chain (arXiv:2507.01606, 2025) and a four-site Ge/Si chain probed by a transmon (arXiv:2501.13367, 2025) exist; the scaling of splitting and coherence with N is unmeasured as of 2026.","title":"Majorana protection scaling in quantum-dot Kitaev 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