There's no concept in physics or quantum mechanics called "quantum theory angle." It's possible you're thinking of something else, or perhaps there's a misunderstanding in the term.

To help clarify, can you provide more context? For example:

* Where did you encounter this term? Was it in a book, article, lecture, or conversation?

* What was the context of the discussion? Were they talking about quantum mechanics, optics, or something else entirely?

Knowing more about the situation will help me understand what you're looking for and provide a relevant response.