Code-breaking quantum algorithm run on a silicon chip

[David Farber <dave () farber net>]

Begin forwarded message:

From: bobr () bobrosenberg phoenix az us
Date: September 5, 2009 12:09:11 PM EDT
To: "Dave Farber" <dave () farber net>
Subject: Code-breaking quantum algorithm run on a silicon chip

Dave

Perhaps for I.P.

Quantum computing continues to make headway.

Cheers,
Bob

--  
Bob Rosenberg
P.O. Box 33023
Phoenix, AZ  85067-3023
Mobile:  602-206-2856
LandLine:  602-274-3012
bob () bobrosenberg phoenix az us



Code-breaking quantum algorithm run on a silicon chip

   * 12:58 04 September 2009 by Colin Barras
http://www.newscientist.com/article/dn17736-codebreaking-quantum-algorithm-run-on-a-silicon-chip.html

A quantum calculation able to crack one of the most common forms of  
data encryption
has been performed on a silicon chip for the first time.

The study demonstrates that complex quantum circuits can be built  
relatively easily
out of silicon and silica – a significant milestone on the road to  
full-blown
quantum computing.

Fifteen years ago, Peter Shor, a computer scientist at the  
Massachusetts Institute
of Technology, predicted that quantum computers could beat even the  
most powerful
supercomputers and crack the widely used RSA encryption algorithm.

...

Quantum chip

The 26-millimetre-long chip was designed and built using standard  
fabrication
processes by Jeremy O'Brien, Jonathan Matthews and Alberto Politi at  
the University
of Bristol, UK. It can run Shor's algorithm in cut-down form –  
confirming that 3 and
5 multiply to form 15, which is the simplest possible demonstration.

Unlike the silicon chips inside conventional computers, the Bristol  
team's chip uses
light rather than electricity. Light-transmitting silica on a silicon  
wafer guides
photons with entangled quantum properties around, an approach first  
demonstrated by
the same team last year.

[snip]





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