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Quantum Teleportation Achieved Over 16 km In China
Laxori666 writes "Scientists in China have succeeded in teleporting information between photons farther than ever before. They transported quantum information over a free space distance of 16 km (10 miles), much farther than the few hundred meters previously achieved, which brings us closer to transmitting information over long distances without the need for a traditional signal."
... I might stop having Cablemodem issues? Sexy!
Buanzo Consulting - 15 Years of GNU/Linux experience, for you.
http://xkcd.com/465/
Unfortunately, what they transmitted was an email for Vi4gra, using an open wifi connection at a Starbucks 10 miles down the road.
Tequila: It's not just for breakfast anymore!
Before you think this is awesome, this is not an ansible, information is transmitted at lightspeed only.
And once they get to an economic level that is closer to what the rest of us enjoy in the Western world, they will start caring. When you are hungry, you only want bread. When you are homeless, you only want shelter. When you have plenty to eat and a decent place to live, you want freedom.
Tequila: It's not just for breakfast anymore!
why does it take that long to get it working ? didn't take scotty that long to figure it out ;)
Chinese scientists merely wrote another fake paper, as is the common practice in Chinese academia:
http://www.chinadaily.com.cn/english/doc/2006-03/15/content_536821.htm
http://www.china.org.cn/china/life/2009-02/04/content_17222202.htm
http://search.yahoo.com/search;_ylt=A0oGkm5hk_VLFq4AU84qk6B4?p=as+china+academic+cheating&fr2=sb-top&fr=404_news&sao=0
Not until they do it over the USA or even France, but not over China.
They stole the idea from Star Trek.
Tequila: It's not just for breakfast anymore!
Isn't it impossible to transmit information via quantum entanglement? Since you cannot determine the state of an entangled particle, you cannot use it to "transmit" information until after you let the other end know, through conventional channels, what each possible state actually stands for. If that's the case, how exactly is this "quantum information transfer" supposed to work.
"In prison you just have to shut your eyes and take it. Here you have to shut your eyes and give it."
Aren't they supposed to explain it all on TV Sunday night?
http://science.slashdot.org/story/10/04/19/0132246/Chinas-Research-Ambitions-Hurt-By-Faked-Results
This story alone makes me skeptical about any major scientific breakthroughs until someone can peer review the results.
Congrats to the hardworking people on the project, however I will be applauding their work with less skepticism when I hear that MIT, Cornell, CMU, etc confirm the results.
This is only a precursor of a secure line of communication, that cannot be tapped, triangulated, or intercepted. Don't worry, the NSA already has it.
The mind conceives, the body achieves, the spirit manifests.
still have to deal with the speed of light.
"There is a way that seems right to a man, but its end is the way of death." Proverbs 16:25 (NKJV)
In what way are photons travelling down a fiber not a traditional signal? Sure, they are entangled, but you still have to ship photons around.
Put my fist through my alarm clock with its ding-dong death inside my ear. - The Blackjacks.
When you have plenty to eat and a decent place to live, you want freedom.
Or maybe you are just too scared of losing that prosperity that you decide not to rock the boat.
When information is power, privacy is freedom.
Monster Cable will find someway to exploit this, of course with enough shielding to protect against a nuclear blast and the heat of the sun.
We should start a new Slashdot and return control to the geeks. It actually wouldn't be that hard to get some users to
I never got any of this newfangled philotic physics. Half of it nobody understands anyway.
No, everyone understands and doesn't understand quantum philotics at the same time, until they are tested. It averages out to half of the population, though.
Odd, because I tend to feel as if I understand it and don't understand it at the same time.
It's only when somebody asks me if I understand it that I come to a conclusion, either way.
And once they get to an economic level that is closer to what the rest of us enjoy in the Western world, they will start caring. When you are hungry, you only want bread. When you are homeless, you only want shelter. When you have plenty to eat and a decent place to live, you want freedom.
Well, that's always been the assumption, anyway. But apparently things are playing out a little differently in China.
American Third Position
Finally, a real choice!
Why is TFA contradicting itself? A traditional signal is always needed, that's one fundamental principle of quantum comunication.
I believe Quantum entanglement is actually a minimum of 10'000 times the speed of light. http://en.wikipedia.org/wiki/Quantum_entanglement#Experiment_measures_.22speed.22_of_the_quantum_non-local_connection
Eliminating ISPs would make for truly free Internet (se PirateBay case) - and the rest of communications. No more disconnecting, no more dependance, no more monopoly of the telephony providers. It would also hopefully make it safer privacy-wise. ;-)
Not to mention all the money saved on cables
Give it time. They are in no way near the level of *average* economic security that we enjoy in the West. They are already getting inflation, which will push up the cost of the goods they produce, but increase the average salary. They are going very far, very fast, but they still have a ways to catch up with the US and Europe in the way of average income.
Tequila: It's not just for breakfast anymore!
Sure you can determine the state of a particle. You can do something that will change its state in a predictable way. Then the other particle, which you haven't changed, changes at the same time.
Which brings us to the question of Relativity: Since there is no such thing as simultaneous time in the universe, per Einstein - that is, what's simultaneous from one perspective is sequential from another - when does the untouched-but-entangled particle change state to match the one we've acted on in a determinative way?
"with their freedom lost all virtue lose" - Milton
You still need a classical signal. Information still cannot be transmitted faster than light.
It's possible there are esoteric uses for this if it could be scaled up dramatically in terms of the sophistication of the state transmitted, and this could matter for quantum computer communication some day, but I fail to see any real use for quantum teleportation today.
I do have a BS in Physics, but that was 15 years ago and I have never done physics professionally - I got sucked up by the nice pay and abundant job market for programmers.
Don't feel bad, this is a pretty common mistake. People read about non-locality and how what happens to one half of an entangled pair affects the other half instantly no matter how far away it is. There does remain some philosophical debate over what entanglement and non-locality really are, but one thing has been supported very well by both theory and experiment: You can't transmit information or power faster than c. In the case of entangled pairs, actions on one half can have a non-local effect that propagates faster than c, but it's not possible to transmit information or power using that effect. In order to make sense of the results and actually observe the effects of non-locality, you typically need to send additional information classically.
So, this will not lead to lag-less communication over vast distances. What it will lead to is quantum crypto networks. Long distance entanglement swapping or quantum teleportation are one of the key ingredients to building a scalable network.
"Scientists in China".
Think I'll be waiting for independent verification of this one then...
If you try to fail and succeed, which have you done?
That's because in China they just make up results like this to please political bosses.
and when you finally have freedom, you then want the government to do everything for you and regulate everything that is not perfect in hopes that the government will make it perfect...then you lose your freedom again.
jsut athnoer menagiensls ltitle psrhae for you to dcoede. Why do we wtsae our tmie dnoig tihs?
Is it possible to generate the needed information in advance?
Odd, because I tend to feel as if I understand it and don't understand it at the same time.
It's only when somebody asks me if I understand it that I come to a conclusion, either way.
Me too, but then I get tangled up and with mixed emotions over the recent death of my cat and wish I never tried to understand in the first place.
Sig Battery depleted. Reverting to safe mode.
Hrm.
"There is a way that seems right to a man, but its end is the way of death." Proverbs 16:25 (NKJV)
Now that is interesting.
"There is a way that seems right to a man, but its end is the way of death." Proverbs 16:25 (NKJV)
QbitTorrent is going to give a few industries some serious headaches, good luck tracking and snooping on free space quantum teleportation.
And the ideas of Star Trek is to move earth civilizations, including China, to other planets.
Really? Because my cat is perfectly fine...Wait...I don't have a cat...
I don't like Linux. This doesn't make me a troll.
Not anymore you don't.
Sig Battery depleted. Reverting to safe mode.
What a bunch of BS. China has about 300 million "regular" people, that is, decent incomes and they shop for food at grocery stores. China has ONE BILLION desperately poor peasants and workers, whose lives are not getting better at all. "Eating bitterness" is an idiom that they use to describe their lives. They are as docile as cattle. They won't be clamoring for freedom anytime soon.
Oh, and Newsweek is a discredited, partisan source. Didn't anyone get the memo?
Shutting down free speech with violence isn't fighting fascism. It IS fascism!
And once they get to an economic level that is closer to what the rest of us enjoy in the Western world, they will start caring. When you are hungry, you only want bread. When you are homeless, you only want shelter. When you have plenty to eat and a decent place to live, you want freedom.
Well, that's always been the assumption, anyway. But apparently things are playing out a little differently in China.
That article's conclusions were misleading and implied that the middle class may not be interested in political freedom anymore. But all of the studies it discussed stated that the middle class still values political freedom, but that it values it less than creature comforts.
This highlights a new tactic by authoritarian regimes in recent decades. They have realized that it is easiest to keep a critical mass of the population comfortable in order to maintain control.
That doesn't mean they aren't primed for revolution. It just means that revolution isn't worth it for them... yet.
Apparently there are liars and thieves everywhere but the thing in China especially is a lack of respect for intellectual property. Many just don't see it as severe as stealing physical property. But it will get better just like the Americans did. There was a time when Charles Dickens angrily accused Americans of stealing, and of course Americans' big brains don't remember that nowadays.
The summary is completely messed up.
Quantum teleportation doesn't have anything to do with quantum communication.
I still don't get it. Could you use a car analogy?
46137
Half of it nobody understands anyway.
Only because "understanding" appears to be highly variable concept depending on field of study. Non-physicists assume that just because a concept cannot be explained in simple (i.e. classical) terms, it has "not been understood". This requirement is foolish. The simplest way (and I'm really oversimplifying here) to see why is to remember that classical physics is a special case of quantum physics. How could you possibly explain everything in the superset in terms of the subset? Paradoxes are the pornography of the pseudo-intellectual.
The idea of any organism is to multiply and spread to new areas, whether we are talking about humans, viruses, bison or trees.
Tequila: It's not just for breakfast anymore!
Newsweek is mistaking transients for a steady state. The middle class and freedom form a self re-inforcing feedback loop. The more middle class, the more freedom, the more freedom, the more middle class, etc.
What's happening in Indonesia, Brazil and Russia as it is portrayed is the middle class advocating its own destruction. Freedoms will be taken away and the middle class will shrink as a result. So there may be a middle class in these countries now, often fueled by things like oil as opposed to a true free and productive society and economy, but there won't be for long if these trends continue.
Could you elaborate?
In that entanglement is the very basis of quantum communication, I'd say it has a fair bit to do with it.
I thought it was a musician who plays any type of organ.
As long as you got 1 bit of communication, you can do anything.
That doesn't mean they aren't primed for revolution. It just means that revolution isn't worth it for them... yet.
The problem is, that statement is just as true for the United States, and not a few other western nations.
All you're doing is restating the fundamental political question faced by all societies - will upsetting the current order bring a more favorable situation than continuing to tolerate it? And I have seen no evidence the Chinese people have decided that question in favor of revolution, any more than the US has.
Less so, actually. If you consider the results of this poll, it appears the Chinese are a lot more contented with their situation than citizens in most western nations are with theirs.
American Third Position
Finally, a real choice!
Apparently there are liars and thieves everywhere but the thing in China especially is a lack of respect for intellectual property. Many just don't see it as severe as stealing physical property. But it will get better just like the Americans did. There was a time when Charles Dickens angrily accused Americans of stealing, and of course Americans' big brains don't remember that nowadays.
Huh? We're not talking about intellectual property here, you goofball, we're talking about intellectual honesty. Whether or not American publishers ripped off Charles Dickens is irrelevant in this context. Matter of fact, the public-at-large benefited by that violation of copyright law: it was only Dickens and his publisher that lost out. Conversely, when scientists are dishonest and lack the requisite ethics to perform good science, we all lose. Not that I'm picking solely on them: our efforts suffer from politics as well, however we seem to get more spectacular examples of scientific fraud out of China. Their cultural imperatives seem to be a disadvantage here.
... on the other hand, this may just be a way to sabotage our researchers by making them waste their time trying to reproduce the un-reproducible.
For their sakes I hope I'm wrong because they'll find themselves heading down the garden path if they don't do something about it
The higher the technology, the sharper that two-edged sword.
What a jerk. Am I supposed to argue with you?
Whoosh?
Sand's overrated... it's just tiny little rocks.
What a jerk. Am I supposed to argue with you?
Nope. I like to spew forth and let people bask in the glow of my overarching wisdom. Or something like that.
The higher the technology, the sharper that two-edged sword.
OK, You are just a little delusional.
I was replying to someone calling the Chinese compulsive thieves. So I was not off topic. If you don't think so, don't reply in this thread.
I've argued with others about this "Their cultural imperatives" before. That's why I dug up this Dickens thing. Look it up on the internet how the American public received Dickens' criticism and you will feel the limit of your understanding of cultures.
The parent was probably referencing having to deal with the speed of light in the sense that you still have to use a traditional form of communication to communicate what measurements to make on the entangled pair.
http://i49.tinypic.com/14mf8uv.jpg
Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.
We can only hope not. We reaching the first point in history where a great many socialist countries are running our of other people's money, but we don't know what comes next. Only Britain seems Hell-bent on fascism, and I have hope even for them, though they will clearly need to pass through a dark place for a while.
We don't know what post-socialism looks like yet, so it's a bit scary. People do learn that the stove is hot after ignoring all the warnings and toughing it, however, and people will learn from the eventual collapse of socialism. I suspect we'll get something new and better as a result, an economic system that takes pernicious feedback into account.
Socialism: a lie told by totalitarians and believed by fools.
Revolutions happen when things start to get better, so that there's hope, but aren't getting better fast enough. China isn't there yet, but it seems likely in my lifetime.
Socialism: a lie told by totalitarians and believed by fools.
And I'd like to add that all this talk of "middle class," economics, and especially wealth are overtly subjective topics. Even the word freedom used by many here seems to jump around all over the place--losing its essential meaning. I don't want to get philosophical here, but "eating bitterness" has been going on for thousands of years for "regular" people, so that's nothing new. Even people in the upper echelon always complain about their "bitter" situations. And economic prosperity that is talked of here and elsewhere in the media seems to gauge against the decadent culture that American has created in abusing the same word, freedom, by making it a license to [fill in the blank]. I think Plato's warning on democracy is more relevant to the U.S. than Aristotle's praise of it. Truly, we sound like a fat pig squealing to the rest of the world when we talk of democratic freedom, when we have effectively lost the understanding of the words like great, legacy, or even the very word, democracy, because we are implicitly speaking of the Great American Legacy of Democracy even though we ourselves have lost our own [C. S. Lewis'] proverbial chest.
This would be very handy for activating an aggressive nano-bot swarm delivered to the US via Wal-Mart stores.
Take the Red Pill.
lollll...a reputation for exaggeration, intellectual theft, and grandiose lying could be a very useful thing...if you do happen to have a top secret project running and somebody breaks security, nobody "outside" will believe it...until you demonstrate it, and that point is the far side of too late.
Orwell: "In a Time of Universal Deceit, telling the Truth is a Revolutionary Act"
"The Asian crisis was a turning point in that sense," says Brookings Institution senior fellow Homi Kharas, who studies the new global middle class. "These countries began pursuing liberalization in their own way, at their own pace, and they've done well. Now they see their success as the fruit of their own efforts," even though it was attained under global systems of free trade and finance set up by the West.
When someone is gently tugging your dick, keep your hand on your wallet. China and India have been successful because they did not adapt Western financial values. Ditto for Brazil and any other country who was large enough to avoid being pressured into the Chicago school of self-destructive economics. Since 1980, the Western world has been destroying markets and free trade by eliminating regulations and fairness - the only things that keep a market competitive, just as a vibrant independent press is that only thing that keeps democracies truly free.
China will soundly destroy the American economy because 1) it's still developing and four times our population, 2) it's typically not imperialistic outside it's own borders, and 3) it's not being run by a voting bloc which believes literally that the earth is 6,000 years old.
Our founding fathers decried Europe for being chained by the monarchist traditions and the shackles of dogmatic religious squabbling. Well, guess who the new Europe is. We just traded Monarchy for Corporatism.
In scientific research that will only get you more scrutiny. In the military, the way to go is to set up a few fake secret projects and let others guess or even lead others to do stupid things in response.
Indeed. Now that I read it again, I see that I completely missed the word 'philotics' in the OP. Just googled it and it's some Syfy babble that has nothing to do with QM - OP probably was a joke of some kind. Pity I wasted my time responding.
So anyone who uses the transporter will end up being mixed up with lead and cheap plastic.
I've got better things to do tonight than die.
Methinks expecting China to do what we would do - or worse, to expect China to do what we have already done - is...myopic.
Orwell: "In a Time of Universal Deceit, telling the Truth is a Revolutionary Act"
Why is it that you people always find it convenient to make snide comments that some other country on the other side of the planet have a moral imperative to shed blood (remember, revolutions are bloody) just to achieve the so called "ideal formula" of "democracy, freedom, liberty" etc?
Do you have any respect for the lives to be lost, families and homes to be destroyed, once the world's most populous nation gets into some sort of civil war?
Don't quote me on this.
Isn't quantum teleportation only possible by using a traditional channel to transmit the quantum state of the particle?
IANAP, but as I recall this was why quantum teleportation is not able to transmit information faster than light.
It works like this. You put a red and a blue shirt in a bag. You and Alice close your eyes. You each take out a shirt and put it in a briefcase. Then you both go on a trip.
When you get to the hotel, you open the briefcase and you have a red shirt. You know Alice's shirt is blue. The next question is, so what?
As you can see from the example, you essentially pre-loaded the answer before you went on the trip. It's not real-time communication when you hand somebody a sealed envelope and walk away.
And when your brain is not mushed from all the trash food, you realize that
you don’t have bread and shelter, BECAUSE you aren’t free! Duh!
Any sufficiently advanced intelligence is indistinguishable from stupidity.
16km, while impressive, is not the record. The summary is completely wrong. Ursin et. al. did it over 144km in 2006, and have plans to do it via satellite (with interesting implications about whether it works through a changing gravity well, and so on).
Unfortunately, my proof is too large to fit in this forum post.
Is it really too large, or are you just afraid that once your theory is observed it will no longer hold?
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
If your statement is true, then I'm back to square one on understanding this "entanglement" thingie. Actually, I never really quite made it to square one, but still...
You're barking up the wrong tree if you're trying to understand....even the master himself said, "nobody understands quantum mechanics."
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
Measuring at different times doesn't appear to matter (See Wheeler's Delayed Choice experiments). Which is very amazing in itself and an entirely different topic of discussion. The problem is that however you set up your experiment, no practical information is exchanged FTL. Alice could measure the entangled pair at the same interval as Bob, but that doesn't really tell her anything since Bob can't actually cause his entangled particle to have a particular spin, polarization, or whatever they're measuring. It's only interesting after the fact when they compare notes.
So you say well then, instead of using the particles let's use the act of measuring or not to transmit info. If Bob measures his particle he's sending a 0, if he doesn't he's sending a 1. And Alice will see this reflected at her end somehow. But the problem with this, from my understanding, is that everything is going to look random to Alice however she chooses to measure it (or however they agree to ahead of time). Because remember you are looking at individual particles. Again, it's only interesting after the fact when they compare notes.
Now the question I am not sure the answer to, is if they were to use a group of photons and either measuring or not measuring the group as a whole. For example, if you think of the classic double slit experiment, doing something to an entangled set of photons to cause their distant pairs to either form a wave-pattern or a blob on a detector. I don't know if this is possible or not, and it sounds like there might actually be some serious debate about this (see Dopfer experiment)
The sending of this message pretty much inconveniences everyone involved.
My sincere condolences, but as a consolation, you may take comfort in the thought that your cat is still alive and well in an alternate universe.
Or maybe you are just too scared of losing that prosperity that you decide not to rock the boat.
It would be way better if you posted a link that didn't say, "You are not authorized to view this page."
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
Half of it nobody understands anyway.
"I think I can safely say that nobody understands quantum mechanics." --Richard Feynman
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
Really? Because my cat is perfectly fine...Wait...I don't have a cat...
Is the cat you don't have alive or dead? Or have you been to lazy to check?
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
But when the second half of the population observes the first half understanding and not understanding, they understand or don't too.
Mod Me Up. You'll make a grown man cry.
but no one was there to hear it. Would there still be information? Ah, the philosophy of quantum physics. I know nothing about physics, ever had a class. After reading 238 postings on this topic, I still know nothing but feel like I am in good company.
Here is a quote I am sure most of you have heard before: "Anyone who says that they understand Quantum Mechanics does not understand Quantum Mechanics" - Richard Feynman
Don't explain computers to laymen. Simpler to explain sex to a virgin. -- Robert A. Heinlein
Well maybe if you hadn't stuffed it in a sack with a capsule of poison gas, these things wouldn't happen.
Posted from my abacus.
Try not to take me more seriously than I take myself.
Revolutions happen when things start to get better, so that there's hope, but aren't getting better fast enough. China isn't there yet, but it seems likely in my lifetime.
Actually it is my understanding that revolutions occur when things were starting to get better, then start to get worse again.
Well, we all know chinese "science" is faked quite often. E.g. : http://www.news24.com/SciTech/News/China-warned-over-fake-science-20100107 and so on. How to make sure this is not just yet another bullshit from them?
But at least it probably goes up to 11.
That was my first thought too. Along with North Korea successfully building a fusion power plant. Just makes them look like idiots.
It worked perfectly fine for me.
Entangle two (or more) particles, effect both of them the same way and monitor when they both react at the same time.
"Most people, I think, don't even know what a rootkit is, so why should they care about it?"
In school, I was taught (and the school system here is not the best, so take it with a grain of salt) that there are two forms of revolution. The situation you describe, where people are desperate because they can't feed themselves and their families, and the situation the GP describes, where people see the possibility for getting more, but it isn't going fast enough. The French revolution (the one in 1789) is an example of the first, I assume the American is an example of the second (but again, abysmal history teaching).
In this universe I graduated from school while in the other universe I did not.
In this universe I get a shitty job. Is my other me in the other universe now suddenly a CEO over night? And how about 3 universes, or 7? Or 9?
ounds like the other universe is full of paradoxes and this one isn't...
That part of Quantum Physics does not apply here... But in the other universe it does?
Come and get me, you Quantards! I can take you in pairs! :)
Here be signatures
It worked perfectly fine for me.
Ah, yes, now I see it is fixed. Perhaps the error was the site's response to too many views in a short time from this referrer domain, or just due to randomness.
"I don't care about the Constitution!" --Bill O'Reilly, November 17, 2009
Except it's not quite like that.
You and Alice put two shirts in a bag, shake it up, close your eyes, and you each pull out a magic mixed-up shirt which cycles through the color spectrum at random varying speeds (but the same speed on each shirt) until you look at it, at which point it stops cycling on one particular color, and the other stops cycling on the complementary color. You put your shirts in your respective briefcases and go on your trips, and when you get there, you open your briefcase and see your shirt has stopped on red. So now you know that if Alice looks in her briefcase, she will see her shirt has stopped on cyan.
However, the question is again, "so what?"
You don't get to decide whether the shirt is red or blue when you look at it (since the speed it cycles at varies randomly, so you can't very well time it or something), so it's not like you can send a "cyan" to Alice for a "0" and a "red" for a "1". Likewise, when Alice opens her briefcase and sees a cyan shirt, she doesn't even know if you have looked at your shirt or not yet; her shirt might have stopped flashing and just landed on "cyan" by chance when she looked at it (making your shirt stop at "red"), or you may have looked at your shirt and seen "red", making her shirt stop right then too on "cyan".
The only thing that's interesting about these synchronized flashing shirts is the fact that when one stops cycling the other stops at EXACTLY the same time no matter how far away they are. We only know this because when you and Alice do this over and over again and then compare your notes afterward, you always find out that your shirt stopped on one color and hers on the complement. That's interesting because if there was any time delay between one stopping and the other, you would expect the hue-difference between the two shirts to vary with distance: at close distances you'd get close to complimentary colors because they stop at close to the same time, while at larger distances the second shirt would stop slightly later making it slightly off from complementary. And of course if there was no communication between them at all, there would be no correlation between what color you see and what color she sees. But you always see red when Alice sees cyan, and you always see yellow when she sees blue, and you always see green when she sees magenta. Which indicates that anybody looking at either shirt not only stops that shirt but also the other shirt instantaneously.
Which isn't of any practical utility, however, for the reasons described two paragraphs above. But it sure as hell is weird, isn't it?
-Forrest Cameranesi, Geek of all Trades
"I am Sam. Sam I am. I do not like trolls, flames, or spam."
I can see a lot of uses in real teleportation:
news at 11, teleportation DRM by Microsoft, Safe or not?
--- I am known for the ones who want to find me on the net. Is that a privacy risk or a privilege? One might wonder..
And truth be told the middle class in most of those countries is small enough that it could be considered upper class relevant to the vast majority of the population. Media articles like that one compare the "middle class" in China or Brazil with a middle class in the US or Ireland, when they should be comparing them to the median lifestyle in their own countries. If your middle class is acting like an upper class, thats because it is one.
What he can't kill, he has sex on. Trent.
That one has already an arrow to define the direction flow of quantum data passing the intersingular relais, which will be cheaper in the end.
--- I am known for the ones who want to find me on the net. Is that a privacy risk or a privilege? One might wonder..
We can only hope not. We reaching the first point in history where a great many socialist countries are running our of other people's money
Whats the national debt of the US again?
What he can't kill, he has sex on. Trent.
thanks for this
How many more years will slashdot have an off-by-one error on your Score in your profile?
http://en.wikipedia.org/wiki/Laki
One could also say that The French revolution was caused by a volcano.
http://www.youtube.com/watch?v=XEZtw1yt8Kc Robert Anton Wilson explains quantum mechanics
people are saying that 'some' change is measured faster than the speed of light just that that change can't be interpreted until other information is transmitted at the speed of light. as long as you are able to measure some change, what stops you from lining up a row of entangled particles and interpreting them as binary? 'some' change is a 1 while no change is a 0. then couldn't one transmit information faster than the speed of light? i wouldn't pretend to understand the mathematics involved in such a thing but from the general knowledge i have gathered on the subject and from the responses of people who claim to be knowledgeable this seems like a reasonable application of this ability.
every time someone tries to explain why QE is more exciting than what you just described, i'm never convinced.
i guess the "neat" thing here is just that the state of the two particles was preserved for so long.
The only thing that's interesting about these synchronized flashing shirts is the fact that when one stops cycling the other stops at EXACTLY the same time no matter how far away they are.
In the context of special relativity, what does it mean for two things to happen at EXACTLY the same time?
It was, the volcano reduced the harvest to the point that people starved, and caused them to revolt. But that is only some of the explanation, the inefficiency of the French bureaucracy and their support for the American revolution also played a part.
When they can teleport people from one continent to another.
If Google really cared they would fix Android Chrome to reflow text, instead of discriminating
In the context of special relativity, what does it mean for two things to happen at EXACTLY the same time?
Well, as you're probably rhetorically pointing out, it doesn't really mean anything at all in a global context; there is no such thing as absolute simultaneity in a special-relativistic world. Given that, I'm not really sure what they mean when they say that the entangled particles communicate "instantaneously", but my best guess would be that they're assuming the two particles are co-moving or close enough to it (both of them sitting in labs not far from each other here on the Earth and all) to ignore special-relativistic effects. I imagine if they were not co-moving you would see the collapse events properly non-simultaneous according to the relative motion of the two particles. (Back in metaphor-land, it'd be like the two shirts still always stop on complementary colors, but because one shirt is cycling faster or slower than the other from their respective different frames of reference, then when the collapse has to occur for that to happen will differ). With the right combination of reference frames you could have the two particles communicating with each other backward in time, as you would expect with superluminal capabilities in a relativistic world; but since that connection is useless for sending useful information, it's not like you can send a message back in time.
-Forrest Cameranesi, Geek of all Trades
"I am Sam. Sam I am. I do not like trolls, flames, or spam."
Jane understands it just fine.
Just don't interrupt her when she's moving the ship.
You are not a brain: http://books.google.com/books?id=2oV61CeDx-YC
Wouldn't the analogy of 'the color cycling stopping' imply that there are three detectable states of the shirt: red, blue, and indeterminate?
Is that actually the case? Can you take a measurement of a quantum system at any time and determine that it is, in fact, indeterminate? Or does taking that measurement always cause its state to be determined?
You are not a brain: http://books.google.com/books?id=2oV61CeDx-YC
Well it wasn't *just* rhetorical. I've heard the claim a bunch of times about quantum entanglement that you can measure the state of an electron at two distant places "at the same time" and they will always be in sync. Its my understanding that this effect doesn't have a distance limit, but if you could get two entangled electrons to opposite sides of the galaxy, their states would still stay in sync.
I don't really know the right language here, lets we stick with your metaphor of two people with your magical color changing shirts. You and Alice synchronize your watches and make a table of their simultaneous checks, and it looks something like this:
Event 1-- Alice:red, you:cyan
Event 2-- Alice:blue, you:yellow
Event 3-- Alice:green, you:magenta
Meanwhile, I'm passing by on a spaceship that is traveling very very fast. Isn't it possible that I'd instead see something like this:
Event A-- Alice: red
Event B-- you: cyan
Event C-- Alice:blue
Event D-- Alice:green, you:yellow
Event E-- you:magenta
I don't know, does that make sense? Is that possible, and if not, what happens? Would the shirts necessarily hold the same color long enough to allow the color of the other shirt to be measured in every frame of reference?
Ah, but you can say in a subsequent e-mail: "If your shirt was blue, the message is X, if your shirt was red, the message is Y", thereby encrypting information.
Every experiment which ends in a big bang is a good experiment.
That's a great question. That's exactly the question everybody should ask before anything else.
The answer is: no, there's no way Bob can tell if Alice changed her particle in any way. There's no FTL communication. As to why should we care, it's complicated (I'm assuming you're asking for a theoretical "why should we care", not practical reasons).
If Alice and Bob do things in a certain way, and then compare results in the end, they can see that in some sense the two photons made a choice in response to the measurements they made, and once the choice was made by one, the other one instantly "knew" and agreed with it.
How they know that is a little complicated to explain, as it involves a little bit of math. Physicists call this "violation of Bell's inequalities"; Wikipedia has something about it in the article about Bell's Theorem. I can't recommend it, though, as it tries to explain a lot in a very short space, so it's not too clear. If you're interested, here's a lecture note that explain it all from the very beginning (only math knowledge assumed) that ends exactly at the point of explaining this effect: http://www.eecs.berkeley.edu/~vazirani/f04quantum/notes/lecture1.pdf
Yes, that's basically how quantum mechanics works. You have three states: red, blue, and I-dont-know-yet.
But you can't measure I-dont-know-yet. When you do, you get red or blue.
So how do they know if particles are entangled? It seems they can be created that way.
For example, if you smash a rock with a hammer, you will get two pieces that add up to the whole. You don't have to measure to know they are "entangled."
But as soon as you measure one piece, you can infer the size and shape of the other.
Because that never happens in America now does it.
Yes Mr president, there are weapons of mass destruction in Iraq, tell Haliburton we can invade at will.
Why yes, the earth is only 6000 years old and any evidence to the contrary is false.
We dont need banking regulations, I'm certain these organisations are responsible enough not to do any serious economic damage.
Calling someone a "hater" only means you can not rationally rebut their argument.
I agree with the others that Chinese academics tend to be unreliable to put it nicely, and Spain's claim is much better. As to how it works for communications, if you remember your chemistry, this works equally well for electrons as photons. Take two hydrogen atoms, and if you entangle their electrons, one electron will have a quantum state of: n=1, l=0, m=0, and s= +1/2 and the other electron has the quantum state of: n=1, l=0, m=0, and s= -1/2. Once they are entangled, if you change the s-state on the first electron to s= -1/2 the s-state on the second one will immediately change to s= +1/2 regardless of its location, and if you change the s-state on the second electron the s-state of the first electron immediately flips. The trick to communications is you need something that can read the s-state and change it on both ends. Then you code one end to read +1/2 as 1 and -1/2 as 0 and the other end the opposite way, you can send and receive any digital information almost instantaneously, regardless of the distance. Bill
Why would you assume that I was excluding the US from the list of socialist countries that are running out of other people's money? But still, I'm hopeful that we'll learn a lesson from examples like Greece before it gets that bad here - we should have a few years, anyhow.
Socialism: a lie told by totalitarians and believed by fools.