[_Marak_]

Time loop logic is a hypothetical system of computation that exploits the Novikov self-consistency principle. In this system the computer is able to send the result of a computation backwards through time and rely upon the self-consistency principle to force the sent result to be correct.

I've written about this before. Instantaneous data transfer with zero lag is theoretically possible through use of quantum entanglement. You can use this same technique to build a doomsday clock similar to the film "Tomorrowland".

[eigenket]

> I've written about this before. Instantaneous data transfer with zero lag is theoretically possible through use of quantum entanglement.

I hope you wrote a correction wherever you wrote this. Quantum entanglement can not transfer information by itself (because of the no-communication theorem) therefore any data transfer protocol that uses entanglement must also use some other form of communication (e.g. classical communication), and therefore is at most as fast as your other communication method is.

[lrschaeffer]

Maybe in general, but this is in the context of "time loop logic". Ordinarily, you can have entangled states where measuring both parts will produce the same (random) outcome. Unfortunately the outcome cannot be influenced by either party, so it's useless for communication, as you say.

Now suppose that the first party resolves to go back in time and kill his grandfather unless the bits he measures are precisely the message he wishes to send. The universe can't tolerate the paradox, so it is corralled into the only non-paradoxical outcome: both parties read the desired message. Something like that, anyway.

[_a_a_a_]

https://en.wikipedia.org/wiki/Novikov_self-consistency_princ...

> The principle asserts that if an event exists that would cause a paradox or any "change" to the past whatsoever, then the probability of that event is zero. It would thus be impossible to create time paradoxes.

Computer says no.

[Terr_]

> Instantaneous data transfer with zero lag is theoretically possible through use of quantum entanglement.

No, that's a common myth about quantum stuff.

The entangled relationship can't be used to transfer information on its own. Whatever you sample from the "instant parts" can only be checked and understood after additional context arrives in a conventional way--limited by the speed of light and the flow of time.

https://www.space.com/41968-quantum-entanglement-faster-than...

There are also other quantum things that the youth of today need to be educated on:

https://www.smbc-comics.com/comic/the-talk-3

[_Marak_]

Ok human. You can read the Hans Moravec paper on CTC and time loop logic to understand Novikov self-consistency principle is formalized, yes you must run the computation for as long as it would have already taken or result will never arrive.

11 years ago I wrote some examples of how password cracking would look like using such setup. https://marak.com/blog/2013-05-13-time-loop-software

I say through "through use of quantum entanglement" as glossy term for reader. Crystalline quantum circuits are not really existing yet so is all scifi.

I won't be able to repsond to further posts in this thread. Cheers.