Measuring time at the quantum level depends on material symmetry

EPFL physicists discovered that quantum event timing depends on a material’s symmetry, offering a breakthrough in measuring ultrafast quantum transitions. The findings address a longstanding challenge in quantum mechanics. The research, led by Professor Hugo Dil, reveals that symmetry properties of materials directly influence the timescales of quantum processes. This challenges traditional views of time in quantum systems. Published in February 2026, the study provides a new framework for observing quantum transitions, which occur on attosecond scales. It bridges theoretical physics and experimental measurement techniques. The work resolves part of the "time problem" in quantum mechanics, where time’s role has remained ambiguous since the theory’s inception. Symmetry now emerges as a key factor. This advancement could impact quantum computing, materials science, and fundamental physics by enabling precise control over quantum dynamics in engineered systems.