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.
Bat Bot Robotic Flapping-Wing Drone
'The dark birdforms dotted the mountaintops like statues of prehistoric beasts, wings outspread...'
NASA's Astronaut Rescue Ball
'Ball and closely-prisoned man plummeted downward..'
ARM Wants To Build Brain Chips
'Slivers of microsoft, angular fragments of colored silicon...'
Sky Fence - A Drone-Proof Shield Created Over Prison
'There’s still a protective field over the whole thing. It volatilizes anything that tries to get through.'
Geoengineering The Atmosphere For Climate Change
'...a uniform temperature for each degree of latitude the year round.'
Archinaut Orbiting Robotic Factory
'mass-produced only in the orbiting factories...'
Cryonic Preservation - The Last Perk You'll Ever Need
'Is there not also a law providing for voluntary suspension of animation?'
Computers Understand Humans By Watching And Modeling Them
Soon, your computer will be watching you... and judging you.
NASA Asks For Moon To Earth Delivery Ideas
'Authority's 3-g catapult was almost one hundred kilometers long...'
Musk Tunnels Wisely Restrict Drivers
Too many robots.
Robot Swarms Controlled With Augmented Reality
'You're not thinking in enough dimensions...'
MIT's C-LEARN Helps Robots Transfer Learning To Other Robots
'Talk Between Robots radio...'
Mini-Brains In A Dish
'Cultured brains on a slab.'
Rapid Automated Search For Habitable Planets Needed
'I was near enough it now to set my automatic astronomical instruments to searching it for a habitable planet.'
WatchSense Perfect For Fat-Fingered Smartwatch Owners
'Now all you had to do was wave your hand in the general direction of the components...'
Digital Construction Platform Robot 3D Prints A Building
'It extrudes material like a spider.'
More SF in the News Stories
More Beyond Technovelgy science news stories