Arqit Quantum ( ARQQ +0.44%) stock sank over the last week of trading as investors moved out of speculative growth stocks.

In 2025, a basic quantum computer can cost anywhere from a few hundred thousand to a few million dollars, depending on its ...

With troubling signs emerging from the broader market, some investors may be inclined to sell their shares while profits are ...

The company is racing to build quantum tech that will be widely adopted, yet it's at the cost of financial health. If IonQ ...

Another reason IonQ, Rigetti Computing, D-Wave Quantum, and Quantum Computing Inc. stocks can plunge by 50% or more in 2026 ...

Instead of looking for the “next” artificial intelligence (AI) stock, some traders are turning to quantum computing stocks ...

Shares in the so-called Quantum Four publicly traded companies are seeing a boost on rumors that the Commerce Department is ...

Quantum computing stocks are stacking cash in 2025, with industry exchange-traded fund Defiance Quantum ETF (ticker: QTUM) up 36.2% year to date as of Nov. 4 and outperformers like Rigetti ...

Quantum Computing ($QUBT) stock was up in the after-hours session after releasing its third-quarter results. Revenue surged ...

Keith Speights has positions in Alphabet and Microsoft. The Motley Fool has positions in and recommends Alphabet, ...

IBM has delivered new Quantum processors, software and algorithm breakthroughs on path to advantage and fault tolerance.