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.

On the 10th, Zuckerberg appeared on the United States' largest podcast, "The Joe Rogan Experience," noting that "there is still a long way to go before quantum computer technology becomes practically useful," and it could take decades for the practical application of quantum computers.