I hope we will soon see quantum computers!doing crypto-currency mining. Quantum computers will provide unprecedented processing power due to the superposition principle. That is instead of either '1' or '0' like in a mundane computer, a quantum computer can be in both '1' and '0' states at the SAME TIME! This is the secret to its super fast processing power. As we discuss, companies like Intel, Microsoft are working on quantum computers and their inception to tackle practical problems ( like mining crypto-currencies ) is not that far away in time.