A tiny lopsidedness in how lasers hit targets might prove that the most basic law of quantum physics is actually wrong.
March 23, 2026
Original Paper
Local asymmetry in interference as a probe of quantum probability
arXiv · 2603.19342
The Takeaway
For a century, the 'Born rule' has dictated that quantum outcomes must follow a specific symmetry. This paper discovers that if this rule is even slightly off, light interference fringes will develop a unique 'skewed' shape, providing a way to test if the basic logic of the subatomic world is flawed.
From the abstract
Quantum interference provides one of the most sensitive probes of quantum mechanics. While linear superposition fixes the positions and quadratic curvature of interference fringes, it remains unclear whether the probabilistic postulate itself, the Born rule, can be tested through finer, local features of interference patterns. Here we show that a minimal deformation of quantum probability gives rise to a robust and symmetry-protected signature: a left-right asymmetry in the local shape of interf