Multi-Party Quantum Communication Possible
Physicists at the Institute for Quantum Computing at the University of Waterloo have demonstrated distributed communication between three entangled photons, at three different locations. The locations, designated as Alice, Bob, and Charlie in the picture below, are several hundreds of meters apart. This experiment proves quantum nonlocality for more than two entangled photons (see the figure below):
(Photons generated in the lab were beamed to separate trailers)
The experiment demonstrated the distribution of three entangled particles, which can eventually be used to do more than pairwise communication where only one party can communicate with another. It opens the possibility for multipartite quantum communication protocols, including Quantum Key Distribution (QKD), third man cryptography, and quantum secret sharing.
“The interesting result is that we now have the ability to do more than paired quantum communication,” said the paper’s lead author Chris Erven, a former IQC PhD student who is now a research assistant at the University of Bristol.
“QKD, so far, has been a pairwise system — meaning that it works best and with less assumptions when you’re only talking with one other person. This is the first experiment where you can now imagine a network of people connected in different ways using the correlations between three or more photons.”
As soon as I heard about this successful experiment, I knew I had heard about this kind of communication system before. In James Blish's 1954 story, he introduces the idea of a Dirac Transmitter; the quote below comes from his 1957 novels combined as Cities in Flight. The Dirac transmitter is a multi-party communication system that allows instantaneous communication across the universe:
...one of the things they offer in payment is a new course which they say will take us into an iron-bearing star cluster, very recently settled, where there's likely to be plenty of work for us."
"So they say."
"...and I belive them," Lutz said sharply. "Everything they've said to me, they've also said on the open air, by Dirac transmitter. The cops have heard every word, not only locally, but wherever in the whole universe that there's a Dirac transceiver."
From Kurzweil AI.
Scroll down for more stories in the same category. (Story submitted 3/26/2014)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 0 )
Related News Stories -
Hurdl PIXL Wearable Helps Fans Connect With Stars
Like Macross Plus!
Advertising Drones Hover Over Traffic In Mexico
'Blurbflies are allowd to travel the streets, buzzing their adverts alive and direct...' - Jeff Noon, 2000.
Audiobooks - Fastest Growing Format In Publishing
'The public preferred lectons...' - Stanislaw Lem, 1961.
Douglas Adams Your Babel Fish Is Ready - The Pilot By Waverly
'You'll need to have this fish in your ear.' - Douglas Adams, 1979.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
Life In Detroit's 'Agrihood' - The First In The U.S.
'countless tiny brown circles in the green fields ...occasional ruins of ancient cities...'
Artificial 'Hairs' To Enhance Senses Of Robots
'Migul had extended from each of the fingertips an inch-long filament of wire...'
The Point Of View Of An Autonomous Car
'It is safe to say that the new model almost revolutionized America in more ways than one...'
You Can't Lose The Travelmate Autonomous Suitcase - It Follows You
'...follow him as faithfully as a well-trained hound.'
ibotn Toddler-Care Mini-Robot
'She's not like a machine. She's like a person. A living person.'
Nuclear Batteries Based On Diamonds Last Millennia
'they just package it and ship it around to wherever people want it...'
Eighth Sense Emotion-Responsive Cloak
'This sensitivity to mood explains the real popularity of bio-fabrics...'
British Airways To Offer An Ingestible Sensor To Passengers
The modern way to get feedback from passengers.
Unique DNA To Foil Parts Counterfeiters
'... the only molecule, a unique protein amino acid, which could not be duplicated.'
MIT Researchers Predict The Future From Still Photos
'What I have in this camera is not a record of what you did just now but what will go on here in the next half hour...'
Mini Robot Uses 2 mm Surgical Tools
'... surgical tool - blades, tweezers, probes - so fine you could just see them with the naked eye.'
Childhood Dreams Of Space Realized! Space Junk Problem Solved!
'Give the noble daydreams a rest, you preachy rookie. Astronauts are wage slaves like everyone else!'
Writhing Robotic Tentacle Uses Laser To Chop Nuke Hardware
'... long, flexible, glittering tentacles... swinging and rattling about its strange body.'
LBNP Device Not Quite 'Artificial Gravity'
'Joe got out the gravity-simulator harnesses..'
China's XPNAV 1 To Use X-Ray Pulsars For Navigation
'For a hyperspace jump, you need at least four beacons for an accurate fix.'
Artificial Muscle Material Is Self-Healing, Super Stretchy
More SF in the News Stories
More Beyond Technovelgy science news stories