i am not into that scene
I have no clue what quantum mechanics actually do. Reminds me somehow of a number 4...
Anyway, when i think of time traveling. I think of wormholes and the like. I think of the paradoxes that come with it. I think time machines can be invented since humans are just curious. Yet i don't think its really possible to change something, and get back so you notice the difference. Since, if you make that change, you actually change your own feature and perhaps cause you won't be born and never invented the time machine, etc.. etc...
what is also mind blowing, is parralel time lines. I sort of imagine a big array:
world[width][height][depth][time][line]
... would take ahuge amount of mem