# Quadratic unconstrained binary optimization

QUBO is the problem of minimizing a quadratic polynomial over binary variables. The quadratic polynomial will be of the form ${\displaystyle E(X_{1},X_{2},...,X_{N})=\sum _{i=1}^{N}\sum _{j=1}^{i}Q_{ij}\times X_{i}\times X_{j}}$ with ${\displaystyle X_{i}\in \{0,1\}}$ and ${\displaystyle c_{i},Q_{ij}\in R}$.