2 quantum devices can communicate with each other at any distance and any point in time...

2 quantum devices can communicate with each other at any distance and any point in time. With quantum-entanglement technology, your buddy can go back in time and still have a live chat with you. This technology already exists but we need to get it out of dark programs. Imagine if we could use quantum computers to play on servers from the past.
>1. Release the technology.
>2. Send a quantum artificially sentient android to a similar dimension (not to affect your timeline, don't want another mandala effect) back in time.
>3. Command the android to hack into the internet and give yourself the items and stats you want for the character of your game.
>4. Childhood nostalgia reincarnate
>5. After you had your fun, command the android to erase your character's data from the server's files and teleport back to your space/time.
>6. Became a mysterious legend in their dimension.

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Quantum entanglement does not disrupt causality

you sure about that?

Yes

yes, there is no way to transmit actual information using quantum entanglement.

based

>2 quantum devices can communicate with each other at any distance and any point in time
no they can't, that's not how entanglement works

proveable using mathematical model?

Yes

Watch some PBS Space Time. Then you'll understand why this isn't a correct understanding.

That said, assuming some future tech allowed what you described, yes it's an interesting story. Good writing prompt user.