A practical quantum computer with enough qubits available and it could complete in minutes calculations that would take ultrafast super-computers years, and your laptop perhaps millions of years.
Much like a light that can be switched on or off, a bit can have only one of two values: “1″ or “0″. For qubits, they can hold a value of “1” or “0” as well as both values at the same time. Described as superposition, this is what allows quantum computers to perform millions of calculations at once.
