1. A computational system, comprising: a computer; and a quantum processor in communication with the computer, the quantum processor comprising: (i) a plurality of quantum devices, wherein each quantum device in the plurality of quantum devices has a respective first basis state and a respective second basis state; and (ii) a plurality of coupling devices, wherein a first coupling device in the plurality of coupling devices couples a first quantum device in the plurality of quantum devices to a second quantum device in the plurality of quantum devices, and wherein the first coupling device is configured to tune a coupling strength between the first quantum device and the second quantum device so that the first quantum device and the second quantum device couple either ferromagnetically or anti-ferromagnetically.