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You're summing up what other people have done and discussed. Other answers have good suggestions regarding how to approach writing this section.PS - Sometimes, the cogent presentation of the theoretical background can itself be considered a contribution.In addition, you can make it more your own by adding some commentary. Why have you chosen these particular tools for your particular problem?
But what I feel different is the perspective of looking the problem.
Maybe everyone's trying to solve the same thing now and then.
Keep in mind that your audience is mostly people in your field (generally), they should be familiar with the area.
Just cite (the best/a few) reference(s), give the result you need (for benefit of somebody from outside the field stumbling on your thesis, or as a reminder to others), and move on.
This is actually very simple ethically: You did research work which - by your description - is experimental.
You ran experiments, you're analyzing data, you're making conclusions based on the data. (and possibly your raw results and experimental setup as well.) The theory section is not plagiarized because you're not claiming this is your original (theoretical) work.
Then, go back and check your version against the standard references to make sure you didn't get anything wrong and that you've included any relevant citations.
If you see that one of the standard sources has explained one of the concepts much better than you did, consider explicitly quoting that source: e.g., "Symplectic widgets were defined by Widgetmeister [Wid83] as [...]".
This may be the case even down to small notational conventions, wording, etc.
So, be absolutely scrupulous in citing, and to have it all in your own head so that you can write it yourself (not literally copying), even while citing, ...