WHAT IF a quantum computer were able to compute SHA256 faster than the entire world's supply of current mining hashpower (750 exahash)...

...and let's say it was able to mine one block per min. In just 33 hours, 6,300 #Bitcoin would be mined.

Then the difficulty would adjust back to a 10 min target.

That same quantum computer would now take 2 weeks to mine 2000 blocks - same as before it existed.

This is how Satoshi designed it. Bitcoin automatically adapts.