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 -
The 'Internet Of Touch' For Telemedicine
'Immediately an enormous apparatus fell on to her out of the ceiling...' - EM Forster, 1909.
Deep Speech 2: Mandarin and English Recognized
'the words came to the ear in perfect English...' - Frank Stockton, 1901.
Netflix Smart Socks Know When You Doze Off
'Presently the speed control slipped out of her relaxed fingers, the lights went out and she slept.' - Robert Heinlein,
Tesla Suit Gives Haptic Hugs
'Then a pressure on the lips...' - Frederik Pohl, 1965.
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.
Denisovans, Neandertals... And Us?
'But in far realms, among strange hominids, you couldn't shun each other, either.'
Patented! Google's Autonomous Delivery Trucks
I hope Google's trucks can find my house!
3 Parent Embryos Approved By Bioethicists
' A tkan merely courts a mlenb and is attracted to a good guur...'
DIY Armed UAV (Toy)
'Each a television eye and a sonic stunner...'
Tired Of Speeders On Your Block? DIY Speed Tracker!
'There is no danger of a vehicle's speed exceeding that allowed in the section in which it happens to be...'
Centriphone Whirling Selfie Camera
''Tight mid-shot and pull out on but behind me,' he told it...'
Eagles Vs. Drones
'Moon bird's view was... partly blocked by the pyramid, so that he did not see the bird-things dark against the brilliant sky...'
SCiO Scanner Wants You To Be Spock
Almost as easy as a tricorder?
Self-Adapting Composite Heals Itself
'...Could seal the punctures that grain-of-sand-sized meteors might make.'
Rigid Clothing, Or Wearable Furniture?
'Earth's scientists solved the problem to some extent by devising rigid metallic clothing...'
Swarming Intelligent Aquatic Surface Robots Ahoy!
'A remote-controlled emulsion, as it were, with uniform center...'
SuitX Cheap Medical Exoskeleton
'... standing on two corrugated-soled titanium footplates...'
Harvesting Energy From Internal Resonance
'Sometimes a man has a windmill on his roof...'
Sticker Harvests Energy From Your Skin
Another way to harvest power from the body.
Twitter Sarcasm Detected By Computer
Myo-Controlled Prosthetic Arm
'Sensitive actuators touch the tendons in your right wrist.'
More SF in the News Stories
More Beyond Technovelgy science news stories