D-Wave, Rigetti Computing and Quantum Computing shares are now down by more than half on the year after critical commentary from tech executives.

Quantum Computing didn't have any news of its own to report, but the company is even smaller than D-Wave, with less than $1 million in revenue over the last four quarters. Its stock has soared even higher than D-Wave's over the last year, a disconnect that could lead to a continued decline in Quantum Computing's shares.

Last year, investors poured into artificial intelligence (AI) stocks, and the biggest players -- from Nvidia (NASDAQ: NVDA) to Amazon -- helped the general market soar. Quantum computing harnesses the principles of quantum mechanics to solve problems that classical computers can't handle.