Google has already claimed that they achieved quantum supremacy. It's a revolutionary in the computing world. I think that through it could help boost the computing power of the blockchain to produce much bitcoins than our present computers.
When dealing with quantum physics you're literally messing around with the fabric of reality. Quantum computers wont just be for calculations and simple computations, the quantum world gets real spooky when you consider the fact that particles can become entangled meaning even if they existed on the other side of the universe, they share the same synchronized connections or even quantum teleportation (instant transmissions/like Goku).
One day I would like to build a quantum blockchain where blocks are instantaneously transmitted to receivers and rebuild the entire internet making information instant with no wires or connections any where of any kind, whether on mars or here on earth.
I call it the Quantum-Network or QuantNet for short. I've got loads of ideas, just don't have the funding.