D-Wave Quantum Inc. said today a peer-reviewed scientific paper proves it has finally passed a critical threshold and achieved “quantum supremacy” — that is, the point at which its quantum computers have finally solved a problem that’s impossible for even the most powerful “classical” computers to do.

The company says it has solved the first problem of scientific relevance with a quantum processor faster than could be done with classical computers—but others disagree

Shares of some quantum computing companies rallied on Thursday, adding to gains from the previous session and bucking the broader market's trend after D-Wave Quantum forecast stronger-than-expected quarterly revenue.