Scientist Achieve Full Power Dense Coding With Superdense Photons

[Ordr]

Source: DailyTech

Kwiat's team took advantage of a more complicated form of entanglement known as hyperentanglement. By hyperentangling photons, the team is able to cause the photons to become entangled in more ways than one, allowing for the full transmission of data and achievement of 2 bits sent per photon.

The achievement of superdense, 2 bit coding carried out by Kwiat, graduate student Julio Barreiro, and postdoctoral researcher Tzu-Chieh Wei (now at the University of Waterloo) described the results in a paper, which has been accepted for publication in the Nature Physics journal.

The new superdense coding relies on conveying both photon's "wiggle" polarization, and its "twisting", its orbital angular momentum. In order to do this, spontaneous parametric down conversion is performed on a pair of nonlinear crystals, creating this phenomenon of dual-parameter hyperentanglement. Data is then transferred from one photon to the other by changing the polarization by applying birefringent phase shifts utilizing liquid crystals.

Read more: http://www.dailytech.com/Scientist+Achieve+Full+Power+Dense+Coding+With+Superdense+Photons/article11237.htm

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Somewhat headache inducing but fascinating nonetheless.

[midnight]

1. Sounds facinating...But what is this about.? Communication?

Any scientists/smart person out there care to lend an opinion on this?

[Ordr]

6. It is ultimately leading to extremely fast and powerful computers.

[and-justice-for-all]

41. Like Cylons?? nt

[Ian David]

2. When can I order my superdense photon cluster from small dog electronics? n/t

[truthisfreedom]

3. This bizarre coupling can link two photons, even if they are located on opposite sides of the galaxy

Sounds like remote viewing. Does Art Bell know about this?

[Moochy]

8. It's ok, it's just information

No mass is travelling faster than light, just information. Which is totally wild.

I've been waiting for a quantum modem since I first heard about this concept.

It means we could have zero-latency remote-control probes exploring other worlds.

[FatDave]

30. Shit yeah! Nonlocality!

I've been waiting for this too! It's not so much about the speed of the computers (though probably that too) as the speed of the network. Instantaneous data transmission at any distance. Einstein called it "spooky action at a distance" and I'm not sure if he ever accepted it.

My understanding (and I'm far from a physicist, I have trouble balancing a checkbook) is that it goes like this. Photons (and I believe electrons) each have a measurable spin, in that they're, you know, spinning. They may spin quite oddly, but they're spinning and we can tell which way, ummm, somehow.

But when you create an entangled pair of particles, they spin completely opposite to each other. They will always maintain a net sum of no spin. Change the spin of one, and it is immediately reflected in the other. And by immediately, I mean instantaneously. Regardless of distance. The particles could be on opposite sides of the universe, but they would still maintain their opposite spins with no delay. Which means faster than light transmission of information. This is what blew Einstein's mind (and it blows the shit out of mine too).

So once you know about nonlocality, it's a simple jump to imagine an array of photons at location A and their entangled pairs at location B somewhere near Alpha Centauri. If a certain direction of spin represents 0, and another direction of spin represents 1, then you have a binary digit. By changing the spin at one location, the spin will change at the other, and you've got instantaneous digital data transmission over even interstellar distances.

Further reading:
http://en.wikipedia.org/wiki/Quantum_entanglement
http://en.wikipedia.org/wiki/Nonlocality

[Moochy]

34. You can buy appliances that use this tech now.

They are essentially guaranteeing the security and integrity of the key exchange over secured data fiber optics.

The "rest" of the traffic between these devices travel over the normal frame relays and leased lines. But banks and telco's can essentially be more secure about how they securely communicate between two nodes using this technology.

As I understand these quantum crypto devices to work, they are only using the nonlocality for the key exchange and that in turn makes it more difficult to compromise key integrity for secure data exchanged over the secure fiber optic physical segment.

Thats what's kind of neat about this tech, you can buy it now, and have been able to for a few years.

[FatDave]

38. I never even considered the security aspects

But man, they're pretty profound. There's really nowhere to intercept that, is there? The data exists at both end points and nowhere in between.

That is completely freaking awesome!

[annabanana]

44. It allows for great control over information. .

And since knowledge is power, there is room for abuse.

[FatDave]

49. Well, the early adopters of all new technologies are the military and pornographers

I'm sure there's Freudian implications in that, but eventually the benefits do trickle down to society. We do have the defense department to thank for this here series of tubes.

[pokercat999]

37. Hell I've love to have a zero-latency internet connection...

Hughes net....sucks but not as much as dial-up.

[Cronopio]

22. Sounds like David Bohm.

It's good to see that one of Bohm's most important ideas - superconnectivity - is getting beyond theory and Buddhist cosmology and into test labs.

[mainegreen]

4. If it's not a 64 bit photon, I don't want it.

Seriously though, that's amazing. 2 bits per photon? Wow.

[Cronopio]

23. Just don't let Microsoft get a hold of the technology.

The universe would implode, and we'd be waiting forever for the service pack release.

[RethugAssKicker]

5. So, what does this mean... super energy?...possible warp speed?

[BB1]

7. Neh, not yet.

But it will make optical data transmission appear closer.

If scientists succeed in encoding single photons with a significant number of data transferable bits, it might make computers so much faster, you'd have to chase it down the street!

[12string]

9. DNA

I remember reading some years ago an article about someone at MIT working on a DNA based computer.Has anyone ever heard what became of those efforts?At the time it was estimated that one pound of DNA would be more powerful than all the computers in existence.The same article also mentioned photon based technology leading to faster computing and the possibility of complex thought by eliminatingthe linear limitations of circuit boards.Does this mean HAL is just around the corner?

[physioex]

42. Come on now...

Warp speed is not a possibility in the near future. According to Einsteins theory of relativity, the closer you get to the speed of light, the heavier you get. And a object with mass can not travel faster or at the speed of light.

[Thor_MN]

45. Left wing mumbo jumbo. I don't move round much in winter an I gets heavier

so this light speed increase in mass garbage cain't be true. 'Sides, universe is only 6000 years old, so nothin could be further than 6000 light years away...

[Paulie]

10. In the Ender series of book, Orson Scott Card writes about the Ansible

http://en.wikipedia.org/wiki/Concepts_in_the_Ender%27s_Game_series#Ansible

Getting closer all the time. :)

[Ordr]

11. I really have to read those books.

I'm always hearing about them and I'm too lazy to pick one up.
Hopefully I'll get on it.

[Paulie]

12. A great writer and they are awesome books

but his politics drive me absolutely bonkers. He's a self described "moderate", but comes off as a republican hit man.

I have several different versions of his Enterverse books (both print and audio), even though I dislike his Democrat hate spewing... love the art, not the artist. :D :D :D

[Zhade]

48. He's a homophobe AND a terrible writer. Ender's Game is the only decent book he's written.

It all goes downhill from there.

[Hugabear]

47. Sure, if you enjoy reading right-wing asshole authors

n/t

[DavidDvorkin]

13. LeGuin coined the word "ansible"

Long before Card was writing.

[stlsaxman]

35. heheh and Card acknowledges that in the story...

from the wiki entry linked above-

Ansible

See also: Ansible

"The official name is Philotic Parallax Instantaneous Communicator," explains Colonel Graff in Ender's Game, "but somebody dredged the name ansible out of an old book somewhere".<1> His description of ansible functions in Xenocide involve a fictional subatomic particle, the philote, and contradicts not only standard physical theory but the results of empirical particle accelerator experiments. In the "Enderverse", the two quarks inside a pi meson can be separated by an arbitrary distance while remaining connected by "philotic rays". This is similar in concept to quantum teleportation due to entanglement, although even that is not capable of faster-than-light communication. Also, in the real world, quark confinement prevents one from separating quarks by more than microscopic distances.

[librechik]

14. Quantum computers and the ancillary developments they may bring

when one packet of info can be delivered without data loss to the other side of the galaxy. Soon we will be all twisted up in figureing out what information is, on a philosophical basis.

[Ordr]

15. "what information is, on a philosophical basis"

We are information.
:)

[librechik]

17. egg-zactly

as the ovary said to the neuron

[Ordr]

31. Baa,

agreed the Zy-goat

[Beam Me Up]

39. Bateson: "Information is news of a difference."

Gregory Bateson, "Steps to an Ecology of Mind" chapter "Form, Substance and Difference."

[NoodleyAppendage]

16. What the hell is a "nonlinear crystal"? Isn't a crystal by definition made up of angular components

Cool article, but I get lost around the "parametric down conversion...performed on a pair of nonlinear crystals" bit.

J

[Ordr]

18. Best I could do.

Good luck:
http://www.rp-photonics.com/nonlinear_crystal_materials.html

[librechik]

19. I think we are talking about helical constructions

rather than the cubical kind

[Ordr]

20. This particular crystal supports that claim.

http://www.rsc.org/ej/CC/1999/a904490f.pdf

[librechik]

24. thanks--after I posted I realized there are so many other crystallline forms

besides the marching lines of carbon and salt crystals they could be referring to--but the "twisting and tangling" the article keeps talking about is so suggestive of DNA style helixes etc. just took a wild guess.

[NoodleyAppendage]

21. Thanks to you both. If I'm reading correctly, the nonlinear refers to the refractive properties...

...and not necessarily to the structure, though this appears to be an important factor in "nonlinearity".

Very interesting stuff.

Everytime I hear about crystal/information/energy work, I think of the glowing blue crystals in that stinker Keanu Reeves Sci-Fi/Intrigue movie, "Chain Reaction." :)

[whistle]

25. Does this mean that all of humanity will now be saved and mankind

...will forever be free of want and disease and despair? :yoiks:

[librechik]

26. no--but that room full of books that fall apart when you touch them

in the distant future? Will have a lot more knowledge in it we will never get around to being able to use.

[MilesColtrane]

27. I think the same team of scientists must have worked on this.

http://www.youtube.com/watch?v=TD1LHejil6M


Personally, I'll wait out the war between Blu Quark™ and HD-Photon™ until one side prevails.

[Freddie Stubbs]

28. Reverse the polarity, Geordi! The tachyon particles are causing the warp field to collpase!

[FatDave]

29. Everybody needs reverse polarity

nt

[sofa king]

50. Hmm. I have mixed feelings...

...About the function and the form.

[pdefalla]

32. This explains a lot

It's obvious that there is a dual-parameter hyperentanglement between Haliburton and the Bush administration.

[EnviroBat]

33. Sounds like some sort of temporal anomaly caused when the warp

field containment generators went off-line. Somehow this resulted in a sub-space phase shifting. to which Picard replied,

[Duer 157099]

36. Super-duper encryption coming soon

If I recall, this is the sort of technology that is necessary for the ultimate in data security, as someone mentioned upthread.

Course, then some quantum hackers will come along...

[Moochy]

40. already here

http://www.google.com/products?q=quantum+encryption&ie=UTF-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wf

[physioex]

43. Ahhh but that may not be possible......

When they grab the information, it gets destroyed. Which means it would have to be recreated.


Ofcourse nothing is impossible, just very hard.... :)

[Thor_MN]

46. But if you can intercept AND establish a new connection to the receiver

you could retransmitt what you receive from the tranmitter, while making a copy for yourself.