>There's no real big theoretical problems in the quantum computer building space The current quantum computers are just on the edge of what we can simulate cla

>There's no real big theoretical problems in the quantum computer building space The current quantum computers are just on the edge of what we can simulate classically, so we can't yet rule out the possibility that realizing a quantum computation requires an exponential amount of energy in the number of qubits. (Though it should be noted that quantum mechanics predicts that this will not happen.)