DGIST team reveals cause of ultrafast decoherence
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- Prof JaeDong Lee led a DGIST research team that uncovered the microscopic mechanism of quantum collapse in open quantum environments, publishing the findings in Advanced Science.
- The team employed a novel Lindblad master‑equation approach that captures electron‑electron and electron‑environment interactions, overcoming limits of conventional quantum master equations.
- The study showed that ultrafast electronic decoherence (1–2 fs) during high‑order harmonic generation stems from interference between superradiance and broadband emission, causing mutual cancellation.
- The findings identified environmental interactions, especially superradiance, as the decisive driver of fast electron dephasing, resolving a decade‑long puzzle.
- The researchers argue that the result bridges ideal quantum theory with practical quantum engineering, challenging the assumption that quantum technologies operate in isolated systems.
- The paper (Gimin Bae et al.) is titled “Superradiance and Broadband Emission Driving Fast Electron Dephasing in Open Quantum Systems” and appears in Advanced Science (2026).
Why it matters: Quantum engineers and technology developers gain a concrete model for decoherence, enabling design of devices that account for environmental interactions, while approaches that assume isolated systems lose relevance and may need redesign. The insight also challenges prevailing quantum‑technology concepts, prompting a shift toward open‑system engineering and potentially accelerating robust quantum sensors, computers, and communication hardware.
