Why would they want to attack the Bitcoin network with a quantum computer when they can mine blocks using it, but again I guess mining with a quantum computer would still not be enough, but with so much power on your CPU device I guess you can sure do a ton of gaming with it, Well in my opinion I will not gonna use it in gaining bitcoin and destroy the bitcoin ecosystem, That much worst depreciating the price of bitcoin now that it is in the bull run state, But for cryptocurrency sake I guess Quantum Powered Miner will be created in mining blocks for every cryptocurrency and Bitcoin can be possible.