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We present PyQUBO, an open-source, Python library for constructing quadratic unconstrained binary optimizations (QUBOs) from the objective functions and the constraints of optimization problems. PyQUBO enables users to prepare QUBOs or Ising models for various combinatorial optimization problems with ease thanks to the abstraction of expressions an...
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... 16 uses the dimod.ExactSolver() method to calculate all possible solutions of the half-adder Hamiltonian. As seen in Codeblock 11, valid solutions have 0 energy. The full-adder takes three binary values -the two operands A and B and a carry value C in from another adder -and outputs the sum S and C out , as with the half-adder. As indicated in Fig. 5, the full-adder can be constructed from two half-adders and an OR gate. Here, A and B are the inputs of one half-adder, whereas their sum-output and C in are the inputs of the second half-adder. The two half-adder carries are joined by the OR gate to output C out , and the sum-output of the second half-adder provides S. A simple 3-bit ...
