Feeds

EXPOSED: bizarre quantum sibling LOVE TRIANGLE

Bob and Alice get jiggy with Charlie while Randy plays voyeur

Boost IT visibility and business value

University of Waterloo boffins have demonstrated a three-way quantum entanglement that shows quantum non-locality can work with more than two particles.*

The regulars of quantum physics, Bob and Alice, and the interloper Charlie, had an appropriately trailer-trash setting, but alas saw precious little one-on-one photon action since they were separated by hundreds of metres.

The details of the experiment are straightforward enough. To test the three-way “Greenberger-Horne-Zeilinger” (GHZ) state, the researchers started by generating photon triplets in a lab. The triplets were then split up: the first was sent through a 580m optical fibre to delay it; the other two were sent to two trailers (Bob and Charlie) that are 700m distant from both the source and from each other.

Randy, the fourth party in the experiment and located in yet another trailer, randomly selected the measurements Alice (the originating lab) would perform on her photons.

The university's release describes the setup in each location: “Each trailer contained detectors, time-tagging devices developed by IQC spin off company Universal Quantum Devices (UQD), and quantum random number generators. To ensure the locality loophole was closed, the random number generators determined how the photon at each trailer would be measured independently.”

By keeping the time window small – less than three nanoseconds – the university says the experiment can rule out any information transfer between the three locations, “a critical condition to prove the non-locality of entanglement.”

Chris Everen, lead author of the University of Waterloo group's paper in Nature Photonics (abstract here) and now a research assistant at the University of Bristol, says the result means groups of people could create quantum-secured networks rather than simple one-on-one pairings:

“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,” he said. ®

Bootnote: The author has corrected the first paragraph, which originally referred to faster-than-light entanglement. This was drawn from early wire releases such as this. However, the Waterloo University release focuses on nonlocality.

The Register notes that researchers in China last year claimed that entanglement appears to operate at speeds faster than light. ®

Gartner critical capabilities for enterprise endpoint backup

More from The Register

next story
LOHAN packs bags for SPACEPORT AMERICA!
Spanish launch goes titsup, we're off to the US of A
BAT-GOBBLING urban SPIDER QUEENS swell to ENORMOUS SIZE
But they'd lose a deathmatch against the coming Humvee-sized, armoured Arctic ones
Gigantic toothless 'DRAGONS' dominated Earth's early skies
Gummy pterosaurs outlived toothy competitors
'Leccy racer whacks petrols in Oz race
ELMOFO rakes in two wins in sanctioned race
TRANSMUTATION claims US LENR company
Ten points of stuff out of a five pound bag
Boffins ID freakish spine-smothered prehistoric critter: The CLAW gave it away
Bizarre-looking creature actually related to velvet worms
CRR-CRRRK, beep, beep: Mars space truck backs out of slippery sand trap
Curiosity finds new drilling target after course correction
Brit balloon bod Bodnar overflies North Pole
B-64 amateur ultralight payload approaching second circumnavigation
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
7 Elements of Radically Simple OS Migration
Avoid the typical headaches of OS migration during your next project by learning about 7 elements of radically simple OS migration.
BYOD's dark side: Data protection
An endpoint data protection solution that adds value to the user and the organization so it can protect itself from data loss as well as leverage corporate data.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?