** Shares of quantum computing firms tumble in extended
trade after Nvidia NVDA.O CEO Jensen Huang said computers
based on the emerging technology are as much as 30 years away
** "So if you kind of said 15 years for very useful quantum
computers, that would probably be on the early side. If you
said, you know, 30 is probably on the late side, but if you
picked 20, I think a whole bunch of us would believe it" — Huang
** Rigetti Computing RGTI.O falls 10.3% while IonQ Inc
IONQ.N is down 8.5%, Quantum Computing Inc QUBT.O down 6.8%
and D-Wave Quantum QBTS.N down 7.4%
** Quantum-computing ETF Defiance Quantum ETF QTUM.O also
falls 2.4%
(Reporting by Juby Babu in Mexico City)
((Juby.Babu@thomsonreuters.com))