Quantum computing stocks are rising again: How long will the rally last for QUBT, D-Wave, IonQ, and Rigetti?

The so-called Quantum Four publicly traded companies have seen their share prices rise since last month’s World Quantum Day. Here’s what’s driving it.

A Rigetti quantum computer on display at the Nvidia GTC in Washington, D.C. on October 29, 2025. [Photo: Kent Nishimura/Bloomberg via Getty Images]

After a rough start to the year,........

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