A regular computer just beat a quantum computer at math because all that "quantum weirdness" was actually just slowing things down.
April 3, 2026
Original Paper
Variational Iterative Rotation Algorithm: Combinatorial Optimization with Classical Kicked Tops
arXiv · 2604.01512
The Takeaway
We usually assume quantum computers will beat classical ones at everything, but this study shows that for certain hard problems, quantum fluctuations act like messy noise. A classical system based on 'spinning tops' found better solutions faster because it lacked that quantum interference.
From the abstract
We investigate a classical formulation of the Quantum Approximate Optimization Algorithm (QAOA), realized as a Hamiltonian dynamical system of classical kicked tops, which we call the Variational Iterative Rotation Algorithm (VIRAL). The variational parameters are the transverse and longitudinal rotation angles at each of the p layers of the circuit. We find that VIRAL outperforms QAOA on the canonical Sherrington-Kirkpatrick spin-glass benchmark at all circuit depths, with the energy density co