For the last few months, a technology known as quantum computing has started receiving a lot of attention. As is often the case when new subject matter enters the spotlight, people try to figure out how to invest in this technology,

Quantum computing was one of the hot trends of the past few months as stocks have doubled or more following Alphabet's (NASDAQ: GOOG) Willow announcement. Investors looking for any way to play the quantum computing space have pushed microcap stocks into the stratosphere.

Quantum computing stocks sank on Wednesday, pausing a year-long rally, after Nvidia CEO Jensen Huang said the technology's practical use was likely two decades away.

Quantum computing is still early, experts say. Finding early stock winners is easier than crunching calculations.

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