Physicists read hidden topology in light despite energy loss
Researchers demonstrated a method to detect topological properties in light systems that lose energy to their surroundings on October 3, 2026.
Topology defined by knots
Physicists describe topological properties as knots in how waves move through materials. These properties are labeled by whole numbers that remain unchanged under small imperfections. The robustness of these numbers makes them central to modern physics for electronics and quantum devices.
Momentum space challenges
Most experiments infer topology from consequences rather than looking directly at momentum space. This approach is compared to determining if a rope is knotted by examining only its ends. The problem becomes harder in non-Hermitian systems where energy leaks away to the environment.
New detection method
Strong energy loss typically shrinks the signal that carries topological information. Scientists asked if they could still read this hidden topology when energy leaks away. The new work addresses this specific catch that has bothered physicists for a long time.
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