Quantum computing stocks went on a roller-coaster ride last month as the high-flying emerging technology sector reacted to commentary from top tech leaders and others in the industry. Quantum stocks had soared in December after Alphabet reported that it had accomplished a new milestone with its Willow quantum chip,

A mid-January note from Mitra Azizirad, Microsoft's chief operating officer of strategic mission and technologies, also opened some eyes. The note, titled, "The Year to Get Quantum Ready," was credited with lifting quantum stocks the week after Huang's "20 years" comment earlier in the month.

The Nvidia CEO, who made Elon Musk and Larry Ellison "beg" for more AI GPUs, argued that quantum computing remains unreliable. Huang said that “very useful quantum computers” are probably two decades down the road.

Quantum computing stocks were red-hot recently, but Jensen Huang just offered optimistic investors a reality check.

Quantum computing is an emerging technology that has the potential to revolutionize many industries. According to a late 2021 Statista forecast, the quantum computing market's total revenue is projected to reach US$8.