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Adding a weak fast-oscillating field could lower the barrier, and the question is how much.","posed_since":"2008","precise":"The Schwinger rate in a constant field, $w = (e E)^2/(4\\pi^3 \\hbar^2 c)\\exp(-\\pi E_S/E)$ with $E_S \\sim 4.4 \\times 10^{13}\\,\\mathrm{statvolt}/\\mathrm{cm}$, is negligible at the $E/E_S \\sim 10^{-3}$ of present peak laser fields (peak intensity about $10^{30}\\,\\mathrm{erg}\\,\\mathrm{s}^{-1}\\,\\mathrm{cm}^{-2}$, approximate), where $\\exp(-\\pi E_S/E) \\sim \\exp(-3000)$. Superposing a weak high-frequency field (dynamically assisted Schwinger mechanism, Schuetzhold, Gies and Dunne 2008) reduces the exponent. For realistic focused optical pulses combined with XFEL or gamma-ray photons, determine the minimal strong-field intensity at which the nonperturbative assisted yield reaches 1 pair per shot, and specify an observable that separates it from perturbative multiphoton Breit-Wheeler pairs.","problem_ref":"b516ca8d4195c70a1ef721de2023759e0832b674691f43367b81c7d3bd80121c","references":"","settled_by":"Calculations of assisted pair yields in realistic 3D focused field geometries beyond the locally constant field approximation, followed by a measurement at the predicted threshold.","status_note":"","title":"Lowest laser intensity for observable dynamically assisted Schwinger 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