Quantum computers compute in ‘qubits’. They exploit the properties of quantum mechanics(how matter behaves on the atomic scale. In this scheme of things), processors can be a 1 and a 0 simultaneously, a state called quantum superposition. While this accelerates the speed of computation, a machine with less than a 100 qubits can solve problems with a lot of data that are even theoretically beyond the capabilities of the most powerful supercomputers.