Nvidia CEO Jensen Huang on Thursday walked back comments he made in January, when he cast doubt on whether useful quantum computers would hit the market in the next 15 years.

But his latest foray into the quantum world appeared to have the opposite effect. Despite Huang's public change of tune, several key stocks in the sector tumbled on Thursday, with

Nvidia CEO Jensen Huang tried to fix a mess he started. It didn’t work. His attempt to walk back his old comments about quantum computing ended up dragging down the same stocks he wanted to help.

The Nvidia Accelerated Quantum Research Center, or NVAQC, will pave the way for “accelerated quantum supercomputing,” the company said. Nvidia isn’t the first to propose mer

The chipmaker NVIDIA held its annual conference in Silicon Valley this week. Among the major announcements: it chose Boston to be the site of its first-ever research center for quantum computing, opening later this year.

In theory, a quantum computer could perform calculations vastly more quickly than today’s conventional computers.