Multipartite Einstein-Podolsky-Rosen Steering may lead to ultra-secure internet

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.250403

by houseofshards • 12 years ago

39 13 12 years ago

journals.aps.org

trurl42• 12 years ago

The content of the article is freely accessible on the arXiv:

http://arxiv.org/abs/1212.2270

And no, this will not lead to ultra-secure internet, which also isn't even mentioned in the article.

crashandburn42• 12 years ago

Exactly, I find it ridiculous that someone or other adds these titles somewhere and no-one disputes them even when the papers have very little to do with the title whatsoever.

Loughla• 12 years ago

It's not ridiculous. It's the first rule of all internet forums.

No one reads the articles.

keithpeter• 12 years ago

Thanks for posting that, although a bus ride to my local University library to consult Phys Rev Letters seems attractive in a nostalgic kind of way.

No direct bearing on the suggestion in the title, but...

http://journals.aps.org/pr/pdf/10.1103/PhysRev.47.777

Original EPR paper. I return to this paper each decade and work through it. About due for another bash now. No references!

http://philoscience.unibe.ch/documents/TexteHS10/bell1964epr...

John Bell's paper on EPR.

jessriedel• 12 years ago

If any HN title ought to be changed to prevent editorializing, this one should. And that will justly kill this article.

akie• 12 years ago

A dummy explanation for non-physicists like me (from http://www.swinburne.edu.au/engineering/caous/news_and_event...):

"Einstein's reservations about quantum mechanics were encapsulated in the 1935 Einstein, Podolsky, Rosen paradox, which highlighted the theory's strange nonlocality. In this paper, we give theoretical proof that special quantum states allow Einstein's nonlocality to be genuinely shared among many observers, regardless of the spatial separation between them. These states possess a property (which Schrodinger called "steering") that not all quantum entangled states have, and may provide unprecedented security for a future quantum internet.

Suppose Alice has a secret message to transmit. Alice may use the states to send multiple parties a quantum encryption key, or, if the message is highly important, she can "secret share" i.e. distribute the key among the receiving parties, so they must collaborate to decipher the message. The important new feature is that (unlike ordinary entanglement) Einstein's nonlocality cannot be faked by classical means without Alice's collusion. Assuming her station is secure, this enables detection not only of hacking attacks during transmission, but of dishonest receivers or sabotage of devices at receiving stations. We show that the special states can be created in different forms so they are useful for messages carried either as optical amplitudes or as photonic qubits."

clef• 12 years ago

We might use it for teleportation in 500/600 years.

btilly2• 12 years ago

No. Quantum entanglement does not allow for transmission of information faster than light. And therefore does not allow you to suddenly move objects from one place to another.

What it does allow for is the synchronization of random data between two places faster than light. So two receivers can securely find themselves in the possession of a shared encryption key, that can then allow them to send information in a way that intermediates can't intercept.

hellrich• 12 years ago

Traveling with the speed of light seems nice enough, yet I don't understand how the results would help with any kind of teleportation.

coldcode• 12 years ago

I have to admit I understood almost nothing of the abstract.

marcosdumay• 12 years ago

Just to make it clear, the usual caveats of quantum cryptography apply:

1 - It requires direct physical links between the involved parties.

2 - It does not provide authentication, and thus is subject to man in the middle attacks.

Multipartite Einstein-Podolsky-Rosen Steering may lead to ultra-secure internet

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