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Teleportation — Fact and Fiction
jcatcw writes "Earlier this week actor Hayden Christensen, of Star Wars fame, and director Doug Liman discussed teleportation with MIT professors to compare the reality to the special effects version in the upcoming movie, Jumper. Edward Farhi, director of the Center for Theoretical Physics at MIT, said, 'It's a little less exotic than what you see in the movie. Teleportation has been done, moving a single proton over two miles. [But] teleporting a person? That is pretty far down the line. The quantum state of a living creature is pretty formidable. That is just not in the foreseeable future.'"
I think you mean space.
Obviously this guy didn't read enough Star Trek technical manuals.
Whenever I see discussion about teleportation discussed, I think about Ilium and how in reality when they were teleporting, they were being killed and brought back to life at the other end, they were never the same person, made of the same atoms, just an exact copy.
"Next week, we'll be discussing the differences between general and special relativity with Big Bird from Sesame Street."
"I teleported home one night
with Ron & Sid & Meg
Ron stole Megan's heart away
and I got Sydney's leg."
- Restaurant at the End of the Universe
The Star Trek method makes perfect sense. Roddenberry & Co. didn't have the budget for establishing shots with shuttle craft and planetary atmospheric flight. They needed something that would be cheap to produce, not eat up lots of show time, and would have a good "wow" factor.
"Earlier this week actor Hayden Christensen, of Star Wars infamy..."
There, fixed that for you.
If full-on analog teleportation using raw physics isn't possible in the short-to-mid term, what about recreation of a person at the endpoint?
What I mean by that, is you are able to identify what in a person's brain (and related nervous systems) that allows them to be their own unique person, and can store that as some kind of information, if that can be sent to a far-off location, to a reusable body or synthetic equivalent. This body could then perform the same role that the original would. You could afterwards read what changed in the meantime to find out what happened.
Of course, like all teleportation/copying ideas, it would challenge our definitions of what makes any of us unique, and the underlying nature of our definition of self.
Ryan Fenton
But does that really matter? Your atoms are being replaced all the time, just small bits at a time. Scanning and sending data, instead of the actual matter or energy, seems much more plausible. You aren't your atoms, you are the information that your current atomic configuration describes. Have any scars? That scar likely doesn't have a single atom that it did at the time of your injury. It's been copied, bit by bit, atom by atom, over and over again. Teleportation differs only in that it does a whole lot of atom swapping all at once. If the information is beamed correctly, "you" will "arrive" properly.
Normal notions of being, self, life and death don't really apply, at least, most of what people think of doesn't apply and if you break it down, it usually comes down to religious questions, like the soul. If you believe that your body requires a supernatural soul to animate it with intelligence and desires, than teleporation likely isn't for you. If you believe that you are essentially a matrix of interacting atoms, a materialist in other words, than it shouldn't bother you.
If I have a long stick and you hold the other end of it and I thrust my end towards you, you will instantly faster than the speed of light feel it at your end.
Although it's a neat idea as a thought experiment with an infinitely rigid stick, in reality the effect cannot be faster than the speed of light as the force you apply accerlerates the molecules at the end closest to your hand first, which in turn apply an increased force against the next molecules along and so on until the force has propogated through the whole stick to the other end. As it's essentially forces accelerating masses, they must still obey special relativity and cannot move faster than the speed of light in a vacuum.
Your ad here.
Science hasn't teleported squat. They've just caused one particle to mimic the quantum state of another. The number of particles at the source hasn't changed. The number of particles at the destination hasn't changed. So in what way was anything "teleported"?
When our name is on the back of your car, we're behind you all the way!
You're exactly right. In fact, the impulse is transmitted at the speed of sound in the stick.
-- Alastair
I'm just assuming that everyone here knows this already, but for the one or two of you who don't know, the Heisenberg Compensator is the part of the ST transporter that deals with the pesky quantum issue of not being able to pin down the exact location of the subatomic particles whizzing around in Picard's body.
Of course it's physically impossible to make such a compensation, and when one of the technical guys on the show's staff (Okuda?) was asked how the Heisenberg Compensator worked, he replied, "Very well, thank you."
Sam! If you will let me be,
I will try them.
You will see.
I've always wondered about the same thing. Rather than beam in a team of commandos down to the surface to kill a bunch of guys, why not just teleport the bad guys off the starboard bow?
My other thoughts:
Using it as a cloning/copy tool, (which was done in a few episodes). "Counselor, why don't you go down to the teleporter and copy yourself so we can have a threesome?" or "Scotty! I need you to copy these 20g bars of latinum for me. I need to go back to the surface and tip one of those green strippers."
Using the teleport as a backup tool. "The captain is dead again. What is the latest tape backup? Do we have one backed up BEFORE he became such a bitch?"
Medicine. Why use a scalpel to remove a liver when you can just beam it out? Why do they still have disease when they can just beam everything BUT the virus back to the ship?
Yeah, we spend too much time pondering things like Star Trek. Then again, I guess that's what made it such a great show; it makes you THINK!
There is no "I disagree" mod for a reason. Flamebait, Troll, and Overrated are not substitutes.
"Scotty! I need you to copy these 20g bars of latinum for me. I need to go back to the surface and tip one of those green strippers."
Latinum cannot be replicated without being detected as "counterfeit." That's why it is used as a currency.
Bill Clinton: Pimp we can believe in. - The Shirt!!!
Here's an extremely simplified version of how Quantum Teleportation works. This model *will* break down if you push it too far, but it's a better model of the real physics than a Star Trek transporter.
1. Go out and buy two identical rubik's cubes.
2. Put them into identical configurations.
3. Send one to the other side of the planet.
4. Now, create any new configuration you want, but record the steps you take. (e.g. Rotate top 90 degrees left, etc.)
5. A person on the other side of the planet with the other cube can now recreate your cube precisely if you call them up and tell them the steps you took.
In quantum-land, there are some rather huge differences, which I'll talk about in a moment. However, the crucial thing to get out of this necessarily imperfect macroscopic example is that this kind of teleportation relies on preparing identical rubik's cubes in advance, classically transporting one of them to the receiver, and communicating via classical channels when actually performing the teleportation. At NO point can information travel faster than light (FTL). i.e. Quantum teleportation does *not* break causality. However, you will note that you can, potentially, communicate a very complex rubik's cube configuration with a very small ammount of classical data, provided you choose your initial state and operations intelligently.
The reality of Quantum Land (This will most likely confuse you. For that, I apologize.)
The pair of identically configured rubik's cubes are meant to be an analogy for an entangled pair, which is the most crucial thing to have in any quantum teleportation scheme. (You can make entangled pairs out of many things, such as photons or electrons. However, these things are typically tiny and simple. Complex Atoms, molecules, etc. don't work so well.) Where the analogy breaks down is entanglement, which is something we just don't see in macroscopic objects. The key idea behind entanglement is that you can place two things into a state that is not separable (i.e. You cannot describe one things state without also describing the other simultaneously), and any operation on one of them will have an effect on the other no matter how far separated the two things are. (NOTE: This does NOT allow FTL communication.) The problem is that quantum operations on entangled states are probabilistic rather than deterministic. If the sender performs operations, measurements really, on her half of the entangled pair and a new particle that is to be teleported, the receiver needs the results of those measurements to do anything useful, such as reconstruct the particle the sender had. Those results *must* be communicated from the sender to the receiver via classical channels.
Another big thing to note about quantum teleportation is that it, currently, is applied to indistinguishable particles. When you copy a rubik's cube, the copy is made up of complex molecules in a configuration that is unique. If you can magically examine the structure of any two real world rubik's cube you can tell them apart. They are distinguishable. A pair of photons in the same state, on the other hand, are indistinguishable. When you perform quantum teleportation, the copy that comes out at the sender's end is an absolutely perfect copy of the original because it has the exact state of the original and the particles themselves are not distinguishable. The state of the original, however, is changed when it is measured in the teleportation process, and there's no way to recover it. Effectively, the original is destroyed and a perfect copy comes out at the other end.
So there you have it. Quantum teleportation isn't really like a Star Trek transporter at all. It actually a lot stranger than that, and much more difficult to grok. (especially the entanglment part) Again, I apologize for not being able to come up with a way to explain entanglement without throwing a lot of math at you. (I'm not sure you can really understand it without the math.)
I've always had this nagging feeling that by disassembling your brain and moving it, that instant of consciousness would cease to be. You would actually die; in the destination pod, what is essentially a perfect clone is born with your memories. Of course, it would be seamless, and your teleported self wouldn't have any recollection of having died. This would also be impossible to prove, but it's what I choose to believe about this fictional device. Teleportation engineers kill humans!