There is a type of quantum state that is so indestructible that even 'total chaos' can't break it.
April 14, 2026
Original Paper
Disorder-immune momentum band winding topology
arXiv · 2604.10486
The Takeaway
Most quantum properties are delicate and destroyed by heat or impurities, but this 'momentum band winding topology' is immune to arbitrarily strong disorder. This could lead to quantum devices that work in messy, real-world conditions without needing extreme protection.
From the abstract
Time is the odd dimension out: Unlike space, it follows the arrow of time, forbidding back-reflections and requiring momentum yet not energy conservation. Tailored temporal variations manipulate momentum bands and engineer waves in time. We show that momentum bands exhibit unique topology, hidden when conventionally considering energy bands: Complex momentum bands may wind, mandating topological localization at time interfaces. We observe this effect in photonic quantum walks and study it under