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 -
India's Commuters Face Philip K Dick's 'Sales Pitch' Future
'All around him the vague half-defined echoes of ads glittered and gibbered...'- Philip K. Dick, 1954.
Secret Service Wants Sarcasm-Detection Software
There must be some website able to help them.
Skype's Translator Like Gernsback's Language Rectifier
'He immediately turned the small shining disc of the Language Rectifier on his instrument till the pointer rested on French.'- Hugo Gernsback, 1911.
Thailand's Chatterbox Social Media App Influences Content
'He adjusted the n, the r and b knobs, and hopefully anticipated a turn for the better in the dire droning-on of the speech...' Philip K. Dick, 1964.
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.
Palcohol Powdered Alcohol - Try Or Ban?
'I had a small can of powdered alcohol disguised as tooth powder...'
pd.id Personal Drink ID Device Like Dune 'Poison Snooper'
'The jeweled hands clutching drinks (and the unobtrusive inspections with tiny remote-cast snoopers)...'
Monsieur Bartending Robot
'He poured the liquids into his maw...'
Cities Detect Gunfire Acoustics With ShotSpotter
'Sound trackers on the roof...'
Cruise Automation's 'Highway Autopilot' For $10K
'It cut her out of the stream of vehicles and reduced the speed of her car...'
Pengheng Space Capsule Hotel Staffed Entirely By Robots
'A planet-wide chain of hotels that specialized in non-human service.'
Electric Bacteria That Live On Pure Energy
'April 5, 1977; that was the night the waveries came.'
EXACTO Smart Bullet From DARPA
Nicely visualized in what 1984 movie?
Neural Implant To Treat Memory Loss
'You've got remote storage. How regular is the update?'
MIT's Shape-Shifting Robot Materials
The T-100, an advanced prototype, is made of liquid metal. Not quite ready.
LS3 AlphaDog Robot Marine Corps Video
'He admired the fast-plodding, articulated legs, so necessary since roads had degenerated...'
Vantablack Is Blacker Than Your Black
'Well, we have a black coating now that’s ninety-nine percent absorptive...'
Remotely Operated Gardening Rover - Student's Space Agricultural Robot
'There were things growing all over the place, not just in some domed enclosures blasted some millions of miles out in to space.'
Revisiting A Cloud City On Venus
Lando Calrissian, are you still available?
'Windowless Cockpit' Like Star Trek's Patent Applied For
Mr. Sulu, take us out.
'No Man's Sky' - The Matrix Is Almost Ready
Ready for an adventure, Neo?
More SF in the News Stories
More Beyond Technovelgy science news stories