I'm struggling to understand the concept of quantum entanglement. I've distilled my understanding into an analogy, and I need your help to validate it. Here it is:
Let's say I receive two envelopes. Both envelopes have this written on them:
Hello! Open this letter...
If the paper inside is red, then other envelope has blue paper.
If the paper inside is blue, then other envelope has red paper.
So, if I open one letter, and the paper inside is red, then I know the other letter contains the blue paper.
Is this equivalent to quantum entanglement? The fact that I will know the color of the other paper when I open (i.e. observe) one envelope?
In theory, if one of the letters "appeared" in a different galaxy, I would still know the color of the paper inside that letter, just by opening my letter, instantly, correct?
Before I open the letter, is the paper inside each envelope in superposition (??), i.e. 50/50, red or blue?
In this analogy, I am assuming that what's written on the letters is true. Is this a correct assumption in quantum physics? I think so yes?
In real quantum physics, would I be able to change the color of one paper, so that I change the color of the other one? No right?