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"Another reason why privacy could be just a passing fad, terrorism is going to get too good. [1997]"
- Larry Niven

EPR Phone  
  Telephony that uses quantum effects for transmission - and is therefore the ultimate in anti-eavesdropping technology.  

After a few minutes of studying his palms, frowning deeply, he picked up his disposable cell and slipped in a new quantum card.

Then he typed in a key code and called a dummy transponder in Nicaragua.

The dummy flashed his call to a number none of them knew, which passed it on - again through a quantum EPR cell - to yet another number.

It took several seconds to connect to the Quiet Man.

From Mariposa, by Greg Bear.
Published by Vanguard Press in 2009
Additional resources -

The "EPR" refers to the 1935 Einstein-Podolsky-Rosen thought experiment in which two particle systems interact with each other in a very particular way and are then separated. Position (let's say) is measured in one system, which then determines position in the other; momentum may then be measured in the second system, violating the uncertainty principle.

This entaglement (or "spukhafte Fernwirkung" or "spooky action at a distance" as Einstein called it) has since been proven in experiments.

It therefore follows (sfnally) that communication should be possible in such a way that it cannot possibly be intercepted (look for Sprint's "Spooky Service at a Distance" available soon!).

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Additional resources:
  More Ideas and Technology from Mariposa
  More Ideas and Technology by Greg Bear
  Tech news articles related to Mariposa
  Tech news articles related to works by Greg Bear

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