8legs: Flatiron institute

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Scientists solved a major quantum physics problem once thought impossible for classical computers

Researchers show a laptop-based classical method can reproduce quantum machine results on a complex spin-system problem.
The team used three-dimensional tensor networks and belief propagation to capture quantum states without full configuration tracking.
Classical results aligned with the D-Wave quantum machine on the studied spin-glass simulation, challenging claims of quantum supremacy.
The study suggests earlier supremacy claims may have overlooked useful classical tricks.
The researchers plan to push toward harder problems relevant to real quantum materials and superconductors.
The work appears in the journal Science, contributing to the ongoing discussion about quantum versus classical approaches.
Belief propagation and tensor networks were key tools enabling efficient, approximate simulations on conventional hardware.
Three-dimensional modeling provided an advantage over simpler two-dimensional reductions used in earlier work.
Earth.com notes that the quantum supremacy claim centers on 'beyond classical' results and real-world hardware advantage.
The study emphasizes that the line between what laptops can handle and quantum machines can do is still moving.

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