Let me avoid the technical aspects to make things easy for all readers.
So someone said that America's NSA has this great computer(quantum computer) that could easily hack Bitcoin private keys. I really doubt his claim but I know for sure that certain computers like the most powerful Super Computers are within the reach of some of this Intelligence organizations.
Do you think such computers can crack any security codes put in place to make Bitcoin very secure?
Let me be clear - there is no functional quantum computers on this planet.
And there will be no such technology in at least next 50 years, dont bother thinking about that.
When there will be a quantum computer, it will be able to hack btc.