Field-programmable ising machine and method of using

A programmably reconfigurable Ising machine comprising:

• a) a plurality of spin circuits, including a first spin circuit and a second spin circuit, wherein each of the plurality of spin circuits comprises:
• i) a spin generator;
• ii) a set of reconfigurable coupling blocks operatively connected to the spin generator, wherein each of the reconfigurable coupling blocks comprises:
• 1) a coupling switch operatively connected to the spin generator;
• 2) a variable coupling unit operatively connected to the coupling switch;
• and
• 3) a pin operatively connected to the variable coupling unit;
• b) a reconfigurable routing network configured to selectively operatively connect the first spin circuit to at least the second spin circuit based on computer instructions, wherein a first spin generator of the first spin circuit and a second spin generator of the second spin circuit are interdependent when the first spin generator and the second spin generator are operatively connected and independent when the first spin generator and the second spin generator are not operatively connected.