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: 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 ")

Tesla Suit Gives Haptic Hugs
'Then a pressure on the lips...' - Frederik Pohl, 1965.

Surreal iPhone Ad Video Parody Channels Dick, Heinlein
'... the audio relay is buried surgically...'- Robert Heinlein, 1951.

Periscope App Signals End Of Journalism
'Jerry berry... panned the camera...'- Larry Niven, 1972.

Students Control Lab Experiments Remotely Via App
'Hello, Europa... Is this your robot I'm looking at, in sector 94?'- James Blish, 1957.



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

ANNABELL AI Can Learn English From Scratch
'...Could understand not only classic programming but also Loglan and English..."

Tesla Suit Gives Haptic Hugs
'Then a pressure on the lips...'

Surgically Implantable Artificial Kidney Starts Testing
'George Walt... proved the workability of wholly mechanical organs...'

Self-Filling Water Bottle Is Beetle-Based
'That moisture trickles down...'

Senate Passes Space Mining Legislation
'The law of filing on newly discovered asteroids was definite...'

Microsoft's Surface Book Is Part Clipboard
'Floyd sometimes wondered if the Newspad, and the fantastic technology behind it, was the last word in man's quest for perfect communications...'

Police Use Predictive Maps ala 'Minority Report' Routinely
'...the data-receptors, and the computing mechanisms that studied and restructured the incoming material.'

Tesla Autopilot Road Trip 2995 Miles, 57 Hours
'The beautiful old car cruised ... under the guidance of its automatic controls...'

The 'Marching Mountains' Of Pluto
Calling Captain Future!

Graphene Thermopile May Grant Predator Heat Vision To Humans
'What the hell are you?'

BitDrones Flying Microbots Model Programmable Matter
'... as though a child should build from nursery blocks a fantastic shape which abruptly is filled with throbbing life.'

Starship Turbolift Elevators Coming From ThyssenKrupp AG
Your sideways elevator is getting closer to your floor.

LineFORM MIT's Shape-Changing Interface
'For an interval, the device struggled with itself...'

LM3D Swim First 3D-Printed Production Car
'Almost as good as the original it was printed from…'

Protopiper Lets You Sketch Full-Size Objects In Real Space
'Plastic comes out of the end of the drawing arm and hardens...'

AI Trainers: Assisting Artificial Intelligences
'[Ava] wouldn't stop until Antar had told her everything he knew...'

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.