Name: Brian Greene Previews NOVA's "The Fabric of the Cosmos"
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At PBS' recent Annual Meeting, physicist and acclaimed author Brian Greene discusses his return to NOVA with "The Fabric of the Cosmos," coming to PBS Wednesdays, November 2-23, 2011, at 9:00 p.m. ET. The four-part miniseries takes us to the frontiers of physics to see how scientists are piecing together the most complete picture yet of space, time, and the universe.

Physicist Brian Greene discusses his return to NOVA with "The Fabric of the Cosmos."

Brian Greene Previews NOVA's "The Fabric of the Cosmos"

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 QUANTUM CONFIDENTIAL
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 Posted: November 3, 2011



 Text:
 
 Top Secret: Quantum Cryptography


 Quantum entanglement is a strange connection between two tiny particles.


 If you observe or measure one of the entangled particles, the other one appears to change.


 This occurs even when the two are separated by vast distances.


 Scientists have begun to use this spooky principle to hide secret information.


 It's called quantum cryptography.



 Narrator:
 
 Imagine you are a spy entrusted with getting the nation's most sensitive secrets into the hands of an ally.


 How can you create a secure code to disguise your messages, so that even the most powerful quantum computer could not break it?


 The trick is to use particles, like photons, to carry the key to your code securely from one person to another, before any important messages are sent.


 Here's how:
 
 Normally, if a code's key gets intercepted, no one's the wiser until it's too late, and somebody else is already using it to read your secret messages. But if the code key is made of two sets of entangled particles, your secrets could be safe. Measuring or observing either set of particles will disturb them, so if someone intercepts your code key and tries to read it, the particles will change.


 Thanks to quantum entanglement, once the code key's been looked at, the legitimate sender now knows the code's been compromised and can make a new one before any real secrets are shared.
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