<$BlogRSDURL$>
Radically Inept
Tuesday, September 28, 2004
  Good news for Info-phobiacs

NEC extends quantum cryptography range and speed
The system can generate quantum keys at a speed of 100Kbps and transmit them over distances of up to 40 kilometers along commercial fiber optic lines. This combination of speed and distance is a world record, and means the system is suitable for commercial use, according to Kazuo Nakamura, senior manager of NEC's quantum information technology group at the company's Fundamental and Environmental Research Laboratories.

The system, which was first tested successfully in April at the company's System Platforms Research Laboratories in Tamagawa, west of Tokyo, contains several breakthroughs from previous technologies used by the company, according to Akio Tajima, assistant manager at the laboratory.

Quantum cryptography systems allow users to exchange keys with the knowledge that they have not been tampered with during transmission. The systems work by embedding the encryption key on photons. As photons cannot be split, they can only end up in one place, either with the receiver or with an eavesdropper.

NEC has been developing a 'round-trip' quantum cryptography method that has a laser and receiver at one end, and a mirror at the other. Until this April, technical issues with the receiver and mirror meant that the system had not been able to work at high speed over long distances, Tajima said.

With prior NEC systems, the detector worked too slowly to cope with correctly registering the photons hitting it. When photons hit the detector, they are turned into electrons. Because the detector creates an avalanche of electrons for each photon strike, it was necessary to find a way to clear the swarm of electrons out of the device quickly so that it could accurately register the arrival of the next photon. The new detector developed by Tajima's team clears that delay faster, so that the system can work reliably at speeds of 100k bps. That's fast enough to be useful commercially, Tajima said.

NEC has improved the system's mirror. NEC's prior systems used a type of mirror called a Faraday Mirror, a device that reflects light in a 90 degree rotation from the input light. The performance of Faraday Mirrors changes with temperature, which affects efficiency. NEC has changed the technology with the mirror so that it works accurately at temperatures between minus five degrees and 70 degrees Celsius, Tajima said.

Scientists have struggled to develop quantum key systems that are fast enough to work through long enough distances in networks to be commercially viable. Photons tend to get scattered and lost in fiber optic cables. More powerful lasers that are needed to shunt more photons over longer distances tend to cause more noise, which degrades efficiency. NEC's new system includes a conventional laser whose power has been optimized so that it creates less noise, Tajima said.
But do we really want commercial entities to continue to operate in secrecy? It seems more like the ability to operate in secrecy, allows them to do more damage. 
|
Comments: Post a Comment
GEORGE W. BUSH - TOUGH ENOUGH TO TORTURE CHILDREN
Any subsidiaries, affiliates, officers, agents, or employees of any site employing compulsory user registration mechanisms are not authorized to access the content or services of this site.

ARCHIVES
02/15/2004 - 02/22/2004 / 02/22/2004 - 02/29/2004 / 03/07/2004 - 03/14/2004 / 03/14/2004 - 03/21/2004 / 03/21/2004 - 03/28/2004 / 03/28/2004 - 04/04/2004 / 04/04/2004 - 04/11/2004 / 04/11/2004 - 04/18/2004 / 04/18/2004 - 04/25/2004 / 04/25/2004 - 05/02/2004 / 05/02/2004 - 05/09/2004 / 05/09/2004 - 05/16/2004 / 05/16/2004 - 05/23/2004 / 05/23/2004 - 05/30/2004 / 05/30/2004 - 06/06/2004 / 06/06/2004 - 06/13/2004 / 06/13/2004 - 06/20/2004 / 06/20/2004 - 06/27/2004 / 06/27/2004 - 07/04/2004 / 07/04/2004 - 07/11/2004 / 07/11/2004 - 07/18/2004 / 07/18/2004 - 07/25/2004 / 07/25/2004 - 08/01/2004 / 08/01/2004 - 08/08/2004 / 08/08/2004 - 08/15/2004 / 08/15/2004 - 08/22/2004 / 08/22/2004 - 08/29/2004 / 08/29/2004 - 09/05/2004 / 09/05/2004 - 09/12/2004 / 09/12/2004 - 09/19/2004 / 09/19/2004 - 09/26/2004 / 09/26/2004 - 10/03/2004 / 10/03/2004 - 10/10/2004 / 10/10/2004 - 10/17/2004 / 10/17/2004 - 10/24/2004 / 10/24/2004 - 10/31/2004 / 10/31/2004 - 11/07/2004 / 11/07/2004 - 11/14/2004 / 11/14/2004 - 11/21/2004 / 11/21/2004 - 11/28/2004 / 11/28/2004 - 12/05/2004 / 12/05/2004 - 12/12/2004 / 12/12/2004 - 12/19/2004 / 12/26/2004 - 01/02/2005 / 01/02/2005 - 01/09/2005 / 01/09/2005 - 01/16/2005 / 08/28/2005 - 09/04/2005 / 09/11/2005 - 09/18/2005 /


  • Site Feed

  • Back to Radically Inept Main Page

  • Selected pieces cross posted at:
  • American Samizdat


  • Authors' Bios:
  • Somewhat accurate, no where close to complete
  • Photo
  • Rick Eddy's bio

  • Radically Inept attempts at shorts, and personal vignettes:
  • A Modest Proposal: A Solution to the Problem of Poverty in America
  • Wherein I confess my complete ignorance of 'common knowledge'
  • Learning from Mikey
  • I remember the Army...
  • A memory hole

  • Rick Eddy pieces:
  • Osama's Hair Stylist
  • Speed and Shorty come by for a visit
  • A rant and a Prediction
  • Rick Eddy on NASCAR and 'Bidness'
  • The continuing saga of Rick Eddy on The Temple of Doom:
  • Rick Eddy on the Temple of Doom (Part One)
  • Rick Eddy on the Temple of Doom (Part Two)
  • Rick Eddy on the Temple of Doom (Part Three)
  • Rick Eddy on the Temple of Doom (Part Four)
  • Rick Eddy on the Temple of Doom (Part Five)


  • The Dailys:
  • lies.com
  • MaxSpeak
  • pandagon.net
  • The Blogging of the President: 2004
  • Modulator
  • North Georgia Dogma
  • The Corpus Callosum
  • Drunken Monkey Style Blogging
  • Fafblog! the whole worlds only source for Fafblog.

  • As time permits:
  • Intel Dump
  • Orcinus Fair and Balanced
  • FuturePundit.com
  • Brad DeLong's Semi-Daily Journal a Weblog
  • Marginal Revolution
  • How Appealing
  • Chris C Mooney
  • Kevin Drum
  • Cyborg Democracy
  • Cursor.org
  • Iraq Now
  • butterfliesandwheels.com
  • Atrios
  • Talking Points Memo
  • Roger Ailes
  • The Panda's Thumb
  • corrente
  • WorldChanging: Another World Is Here
  • The Truth Laid Bear
  • Fables of the reconstruction
  • Oliver Willis: Like Kryptonite To Stupid
  • Kieran Healy's Weblog
  • Happy Furry Puppy Story Time with Norbizness
  • TheAgitator.com
  • Paperwight's Fair Shot
  • Lotus - Surviving a Dark Time
  • thoughts on the eve of the apocalypse
  • The River
  • Mind is Moving
  • commonSci
  • dr. menlo: promoting people over profits since 2000
  • Where We're Bound
  • Boing Boing: A Directory of Wonderful Things
  • NET POLITIK
  • Public Domain Progress

  • Infrequent, but worthy posters:
  • Rogue Analyst (My other blog)
  • CenterPoint - A Centrist Weblog
  • scratchings
  • Inspector Lohmann


  • Excellent sources of info:
  • Farmers and Consumers Market Bulletin
  • TomDispatch
  • KurzweilAI.net
  • Open Government Information Awareness
  • SPACE.com
  • Agnosticism / Atheism - Skeptical Inquiry, Freethought, & Religious Philosophy
  • Defense and the National Interest
  • Google News
  • TCS: Tech Central Station - Where Free Markets Meet Technology
  • ajeeb, News
  • Corp Watch
  • Center for Strategic & Budgetary Assessments
  • GlobalSecurity.org
  • Moving Ideas: Connecting You To The Progressive Community
  • The Memory Hole [rescuing knowledge, freeing information]
  • The International Campaign for Justice in Bhopal
  • -:| CHINA TODAY |:-
  • Alex Jones' Prison Planet.com: The Earth Is Being Turned Into A Prison Planet
  • Alex Jones Presents Infowars.com to Fight the New World Order --There's a War on For Your Mind
  • THE WAR IN CONTEXT:: Iraq, the War on Terrorism, and the Middle East Conflict - in Critical Perspective


  • Fun and off the beaten path:
  • GHOST TOWN - Chernobyl Pictures - Kidofspeed - Elena
  • Cooperative Extension Service (GA)- Publications
  • MEGA START PAGE
  • The Vaults of Erowid
  • Eyeballing Series


  • What I'm listening to:
  • Radio Paradise - eclectic online rock radio
  • Shameless plug
  • Big Rock Studio Technologies


  • Powered by Blogger

    Weblog Commenting and Trackback by HaloScan.com Site Meter