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 papers 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 youre 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: 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 | | Digg | Reddit |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 0 )

Related News Stories - (" Communication ")

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.

Cortana Clip - The New In-Ear Wearables
'And in her ears the little Seashells, the thimble radios tamped tight...' - Ray Bradbury, 1953.

FlexEnable OLED Bracelet SmartPhone Concept
'The tiny screen in the bracelet's center...' - Roger Zelazny, 1980.



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.






Current News

Robots And AIs Will Replace Humans At 7 Percent Of U.S. Jobs
'And Mike took on endless new jobs.'

Human Doctors Still Better Than Computers
'Nowadays surgery was normally done by autodocs...'

FEDOR Humanoid Robot To Join Russians In Space
Am enjoying view of Russian robot.

BMW Self-Balancing Motorcycle - Never Put Feet On Road
'He had never ridden any motorized device that lacked onboard steering and balance systems...'

MicroTug Is A Micro Robot Beast
'And it had been dragging something...'

Linear Elastic Actuator in Parallel (LEAP) - It's A Hopping Robot
'...Probably the most grotesque forms of transportation ever invented.'

Smart Glove Controls 3D Printed Robotic Arm (Waldo!)
'Waldo flexed and extended his fingers gently; the... waldoes... followed in exact, simultaneous parallelism.'

Wearables For Animals Totally A Thing
'Twin deformities on either side of his skull had been engineered to house sensor units.'

Tomatoes From Sun And Seawater
'Hydroponics. Gotta almost do it, if I'm going way out to Mars without much supplies.'

Hadrian X Construction Robot From Fastbrick Robotics
Hope Hadrian is never a runaway!

Confirm 100 Exoplanets At Once! (With Video)
'My automatic astronomical instruments searching for a habitable planet.'

Blue Origin Tests 'Escape Pod' Capability
'I'm going to regret this...'

3D Printed Car Can Launch POV Drone
Just the thing for the Runaway squad - and you and me.

Japanese AI Forms Suicidally Depressed Personality
'I think you ought to know I'm feeling very depressed.'

Duoskin Control Tattoo
'Three rows of four colored dots appeared on the heel of my left hand.'

Space Elevator Planned By Obayashi Corp
'And so to establish an elevator system linking Earth to space?'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise | - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.