computer knows answer before being asked

[nn_step]

I thought it is kind of cool
http://www.news.uiuc.edu/news/06/0222quantum.html
By placing our photon in a quantum superposition of running and not running the search algorithm, we obtained information about the answer even when the photon did not run the search algorithm
now if could use that for SuperPI :slobber: -5 seconds beat that :D

[Kallenator]

I thought it is kind of cool
[rul]http://www.news.uiuc.edu/news/06/0222quantum.html[/url]

now if could use that for SuperPI :slobber: -5 seconds beat that :D

"By placing our photon in a quantum superposition of running and not running the search algorithm, we obtained information about the answer even when the photon did not run the search algorithm"

Even if I think really hard I cant possibly understand what that is suposed to mean. :p

[Dr_at_Home]

Even if I think really hard I cant possibly understand what that is suposed to mean. :p
Same.. I think it must be something good though!:woot:


:p:

[craig588]

So you're not putting anything in and you're getting crap you didn't want out?

[Shadowmage]

I'm guessing that time travel is involved.

I'm not :banana::banana::banana::banana:ting you: if you accelerate a photon past the speed of light, it will appear before you even perform the experiment.

[Pinnacle]

Dont worry guys. NN is losing it again. :)

I got no idea what that means, either.

[Pinnacle]

I'm not :banana::banana::banana::banana:ting you: if you accelerate a photon past the speed of light, it will appear before you even perform the experiment.

IS that possible??

[Shadowmage]

It was in Nature magazine, i remember. Nature is this very popular magazine where researchers submit their products.

Of course, they appear microseconds before the experiment. It's not like an hour before or anything crazy like that :)

[biohead]

so where does the photon come from if u don't perform anything. huh?

[OmegaMerc]

You cant make energy without spending energy, so to make something out of nothing is impossible.

[nn_step]

You cant make energy without spending energy, so to make something out of nothing is impossible.
OK it looks like I need to explain this.. the idea is that by precharging an electron.. it will have a certain spin on it.. and when it is released and eventually returns it should have a different Spin on it.. but what they found is that the electron can become the Charge it needs in order to return with out ever having to be released...

[biohead]

You cant make energy without spending energy, so to make something out of nothing is impossible.
according to einstein it is. but besides that, it's impossible to believe.

[n00b 0f l337]

Your spending energy, but its propositional energy, energy that isnt usable yet.
Basically energy from a point beyond the present.

[WeStSiDePLaYa]

i think this is BS.

how can you have the effect BEFORE the cause? what garuntee is there that once the effect has occured, you would continue to do the cause?

the only reason something happens is because energy is transfered to make it happen. so how can something happen BEFORE the energy needed to due such task is transferred?

[ozzimark]

just bend the space-time curve back into itself :confused2


ps.. i sorta know how this happens, but i have no idea how to explain it. photons emit temporary particles all the time.. sorta

[nn_step]

just bend the space-time curve back into itself :confused2


ps.. i sorta know how this happens, but i have no idea how to explain it. photons emit temporary particles all the time.. sorta
no we are talking abut Quantium Spin here..

[biohead]

time doesn't exist

[mnewxcv]

time doesn't exist


uh oh :)


as u aproach the speed of light, time goes slower and slower. at the speed of light time is "paused". past it, it goes in reverse. shadowmage's post seems accurate.

edit: should say this is theory and not fact

[Mr. Manka]

correct, it is called time dilation, and Please explain how you can make something with a mass (photon), go faster than the speed of light.

[Shadowmage]

http://news.bbc.co.uk/1/hi/sci/tech/781199.stm

However, other articles say that although parts of the wave may arrive before the experiment starts, no real information is actually sent.

[Cobalt]

correct, it is called time dilation, and Please explain how you can make something with a mass (photon), go faster than the speed of light.

A photon has no mass, its the particle form of light. Light can be said to be described as both a particle(photon) and a wave (harder to describe). Its called wave-particle duality. Time dialation is subjective. Its appears to go slower to an outside observer but to the object traveling at near the speed of light everyone else appears to slow down

And anyone who said this is impossible is wrong. Its all perfectly possible, your understanding of quantum physics is flawed. Don't take that too hard because just about everyone's understanding is wrong. The problem with this method is that it can never be used to create a computer in the sense we know it and still retain the ability to calculate the answer to a question that hasn't yet been asked.

Entanglement has already been used to create a different sort of quantum computer (quantum computer just means any computer that exploits the laws of quamtum physics to perform calculations). They can move photons and even whole atoms to a different point instantly and without moving through the intervening space. I'd say thats more impressive as it can be use to create computers which don't have to worry about transistors and such as well as creating the possiblity of teleportation devices (a la Star Trek)

[DeltZ]

does one need cause and effect if the multiverse is infinite?

[dsecrieru]

About the experiment with the light speed: light speed is a value measured in vacuum, I think. What they did was to put some photons through a different medium (cesium chamber?) and they said they measured a speed a little higher than the previous measured value.

So instead of "faster", maybe "more accurate" or "dependent on medium"?

[Cobalt]

dsecrieru is right there. I forgot about that effect. You can actually observe particles trqveling faster than the speed of light if you slow down the speed of light by performing the expiriment in a medium with a high refractive index. Speed of light is more flexible than people think.

[RTB]

does one need cause and effect if the multiverse is infinite?
Soon, they'll find the underverse, and someone's gonna start the Necromonger hype again...:stick:

[STEvil]

dsecrieru is right there. I forgot about that effect. You can actually observe particles trqveling faster than the speed of light if you slow down the speed of light by performing the expiriment in a medium with a high refractive index. Speed of light is more flexible than people think.

technically there is no "speed of light"

This is because the emitter source will dictate the speed, while the medium plays no role in a true vacuum.

[flutie98]

every one repeat with me, phase velocity vs group velocity of light. no electromagnetic wave travels faster (group velocity) = c or ~3e8 which is acctually derived from maxwells equations, which ultimatly solves to be c = 1/sqrt(u0e0) where u0= magentice permitivity of a vaccum and e0= electric permitivaty in a vaccum

when any one observes the "beam" of light to be faster than c they are measuring the phase shift of the wave not the acctual speed

in regards to the article, this is just a problem with quantum theory but this problem has been tilted to be viewd as a good thing. this type of thinking would never work as a functional computer.