Quantum computers can perform all the operations of a legacy computer. They also can store and process exponentially more information and solve optimization problems at speeds that legacy computers can’t match. They will not replace legacy computers, but they will be valuable in performing functions such as computing probability. Quantum computer models leverage the principles of quantum mechanics—the physics concerned with the behavior of subatomic particles. Instead of the bit (0 or 1) used to process data in legacy computers, quantum computers use the qubit, which can act as both a 0...