Feeds

Canary Islands host long-distance quantum teleportation

Spooky action between La Palma and Tenerife, with space the next stop

Top three mobile application threats

The Canary Islands of La Palma and Tenerife have been briefly connected by a quantum teleportation system that sets a new distance record for the spooky communications technique.

In an angle that will get Trekkie bloggers reaching for the “beam me up” metaphors, the researchers, from Austria, Germany, Canada and Norway, hope that quantum teleportation could one day be used for ground-to-satellite communications.

In quantum teleportation, the phenomenon known as “entanglement” to transmit information instantaneously. As long as entanglement isn’t destroyed, the state of one particles – in this case, photons – will reflect changes to the state of the other, regardless of distance (one of the characteristics of quantum physics that troubled Albert Einsten).

The long-distance teleportation setup.

Source: arXiv:1205.3909v1

The 143-km teleportation involves three photons. Alice (in La Palma) generates an entangled pair of photons, and sends one over a non-quantum channel (a fibre) to Bob (in Tenerife). The teleportation photon (generated by a third party, Charlie, in La Palma) is provided to Alice, and when its state is projected onto Alice’s photon, Bob is able to measure its state at the far end of the link.

In the Canary Islands experiment, submitted to Arxiv, entanglement was also used to synchronise time between the two ends of the channel.

An extra wrinkle in the experiment was that one of the photons was sent through the atmosphere – an important technical step, since the experimenters hope to establish that quantum teleportation can be used to communicate with satellites. It is, however, very difficult to preserve quantum states while sending a photon through 143 km of air, water vapour, clouds and the like.

As the paper notes, “the severe environmental conditions imposed demanding requirements onto the whole long-distance teleportation setup: link attenuation fluctuations due to atmospheric turbulence, induced by the harsh meteorological situations including rapid temperature change, sand storms, rain, fog, strong wind and even snow”. The weather, they note, delayed the experiment for a year.

The new distance record for quantum teleportation eclipses an earlier experiment in which researchers from the University of Science and Technology in China at Shanghai teleported entangled photons across 97 km. ®

3 Big data security analytics techniques

More from The Register

next story
KILLER SPONGES menacing California coastline
Surfers are safe, crustaceans less so
Opportunity selfie: Martian winds have given the spunky ol' rover a spring cleaning
Power levels up 70 per cent as the rover keeps on truckin'
Liftoff! SpaceX Falcon 9 lifts Dragon on third resupply mission to ISS
SpaceX snaps smartly into one-second launch window
KILLER ROBOTS, DNA TAMPERING and PEEPING CYBORGS: the future looks bright!
Americans optimistic about technology despite being afraid of EVERYTHING
Discovery time for 200m WONDER MATERIALS shaved from 4 MILLENNIA... to 4 years
Alloy, Alloy: Boffins in speed-classification breakthrough
R.I.P. LADEE: Probe smashes into lunar surface at 3,600mph
Swan dive signs off successful science mission
Elon Musk's LEAKY THRUSTER gas stalls Space Station supply run
Helium seeps from Falcon 9 first stage, delays new legs for NASA robonaut
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.