D-wave CQM model objective function implementation

 

Thank you for your Quantum annealing machine.

First of all, It is a very useful and great machine.

But I am a beginner studying Quantum annealing machines.

Therefore, I want to get your advice.

 

My question is when I implement an objective, I get an error such as multiplying two variables.

For example, I consider the Quantum Annealing algorithm for solving the optimization problem in wireless communication. 

The objective function consists of (x_1 + x_2 + x_3)^2. I just make the objective easy to understand you. It can be easy in the case of small-scale. Because I can make one by one for each term. But I consider large-scale wireless communication optimization. So the objective is very complex.

For instance, maximize : {\sum_{i=1}^{100}\sum_{j=1}^{100}cost{i}X_{i,j}}^2

After summation, I have to do the square process. It is difficult for me. 

Please give me a hand.