The Quantum Experiment That Simulates A Time Machine
Public_Domain @ Thu Jan 29, 2015 4:43 pm
2Cdo @ Thu Jan 29, 2015 4:46 pm
Public_Domain Public_Domain:
The writing on the wall for sometime for that guy, he's the one who wrote it.
I agree he was his own worst enemy, but that doesn't change the attitude of the entrenched lefties in TO politics who wanted him out from day one and were willing to do whatever it took to make it happen.
Now if Ford had a time machine he could go back and plan for all those counselors to have an "accident".
(Trying to get back on topic somehow) 
Freakinoldguy @ Thu Jan 29, 2015 6:51 pm
Public_Domain Public_Domain:
I just try to be more competent than Rob Ford. If I can do that, then I'm accomplished.
Just by posting semi coherently on this forum, not drooling on your keyboard and not continually abusing alcohol and drugs leading to a meth fuelled rant about the Police Chief of Toronto is a pretty good start.
Jabberwalker @ Thu Jan 29, 2015 7:05 pm
raydan raydan:
I wonder what quantum sex is like? ![[huh]](./images/smilies/icon_scratch.gif "huh?")
It jumps all over, sometimes happening with two partners at once!
raydan @ Thu Jan 29, 2015 7:09 pm
Jabberwalker Jabberwalker:
raydan raydan:
I wonder what quantum sex is like?
It jumps all over, sometimes happening with two partners at once!
DrCaleb DrCaleb:
I think they proved mathematically that a billiard ball entering a closed time loop wormhole will always meet itself exiting the wormhole and get knocked away and prevented from entering the wormhole. In which case, it never entered the wormhole. 
If DrCaleb is right, quantum sex is impossible.
Public_Domain @ Thu Jan 29, 2015 8:48 pm
Zipperfish @ Fri Jan 30, 2015 12:32 am
DrCaleb DrCaleb:
Zipperfish Zipperfish:
DrCaleb DrCaleb:
We did that experiment back in January 2015.
Exactly, my older self told me all about it. Pretty goood reading though, thanks.. My personal theory is that interactions through closed time-like loops can, and maybe even do, happen. However they would spin off their own unniverse. So in the one where you kill your grandfather time proceeds along it's curve then loops back like a number nine (travelling back in time) to where you kill your grandfather (where the lines in the "9" intersect. And then the circle of the "9" just plays itself out over and over again. The universe is stuck in a time circle and time never moves forward again. Which serves you right for shooting your grandfather. What a mean thing to do.
9
Of course, I'm a believer in the many-worlds interpretation of quantum dynamics, so this seems the logical solution for me.
Actually! . . . I think they proved mathematically that a billiard ball entering a closed time loop wormhole will always meet itself exiting the wormhole and get knocked away and prevented from entering the wormhole. In which case, it never entered the wormhole.
Exactly. But the billiard ball that went in is stuck in an infinite time loop.
DrCaleb @ Fri Jan 30, 2015 7:27 am
raydan raydan:
I wonder what quantum sex is like?
It would exit the same time it entered, so . . .basically just like every other Friday night.
DrCaleb @ Fri Jan 30, 2015 7:35 am
Public_Domain Public_Domain:
Here's my shitty attempt to weigh into something way out of my league (par for the course for my whole membership here):
So we can't send an object back in time because the previous object basically closes the loop... But they are working on manipulating the past object? I wonder if they'll be able to figure out methods with which to alter past objects without "travelling" a current object back in time, causing the present object to start exhibiting that altered past?
So we can't send an object back in time because the previous object basically closes the loop... But they are working on manipulating the past object? I wonder if they'll be able to figure out methods with which to alter past objects without "travelling" a current object back in time, causing the present object to start exhibiting that altered past?
No, that experiment was for a wormhole that enters and exits the same point in spacetime. If it exited a different point in spacetime, then there would be time travel. But that was the result of a theoretical experiment in the 90's.
In the article, they actually manged to get a photon to interact with a past version of itself. It should have canceled itself out, but it didn't!
$1:
That turns out to be straightforward to simulate using a pair of entangled photons. These are photon pairs created from a single photon and so therefore share the same existence in the form of a wave function.
Ringbauer and co send these photons through an optical circuit which gives them arbitrary polarisation states and then allows them to interfere when they hit a partially polarising beam splitter. By carefully setting the experimental parameters, this entangled system can simulate the behaviour of a photon interacting with an older version of itself.
Ringbauer and co send these photons through an optical circuit which gives them arbitrary polarisation states and then allows them to interfere when they hit a partially polarising beam splitter. By carefully setting the experimental parameters, this entangled system can simulate the behaviour of a photon interacting with an older version of itself.
$1:
There are some curious wrinkles in these results too. For example, Ringbauer and co say that quantum inputs can change the output in a non-linear way but only for some experimental set ups. In other words, they can control the way the experiment twists causality, which is an interesting avenue for exploring just how far it is possible to distort cause and effect.
So they are saying that they can alter a past object, and in ways that aren't anticipated.