Feeds

Entangled matter the next big thing in qubits

Teleportation inches forward

Intelligent flash storage arrays

Researchers at the Max Planck Institute are trumpeting as a breakthrough the successful teleportation of quantum information over 21 metres.

To be fair, however, the record they're claiming to have set is for “matter-matter teleportation” – rather than merely carrying a quantum state such as polarisation between a pair of entangled photons, their new research demonstrates entanglement between single atoms entrapped in optical cavities.

That's important, the researchers say, because trapped atoms offer at least a feasible path to quantum memory, compared to atoms in free space, which are the subject of most matter-matter entanglement experiments. By using the trapped atoms, the scientists hope they've identified a mechanism that's more scalable.

In this experiment, the scientists teleported the spin state of the atomic qubit in one node to the other. Entangled photons were used to map the states – at node A, the spin was mapped onto the photon's polarisation.

At the second node, an entanglement was generated beween a photon and a second trapped atom, and when a Bell state measurement is made of the two photons, the photons are destroyed and the second atom's state is projected onto the first atom.

The scheme only has an efficiency of 0.1 percent, but the researchers say this is 100,000 times higher than achieved in previous experiments.

Christian Nölleke, lead author of the paper to be published in Physical Review Letters, says “Future plans include to increase the light-matter interaction by using cavities that provide us with a higher atom-photon coupling strength. This would increase the efficiency of our protocol even further. Another prospect is to implement a different type of Bell-state measurement to increase the efficiency.”

The pre-press version of Nölleke's research is at Arxiv. ®

Providing a secure and efficient Helpdesk

More from The Register

next story
GRAV WAVE DRAMA: 'Big Bang echo' may have been grit on the scanner – boffins
Exit Planet Dust on faster-than-light expansion of universe
SpaceX Dragon cargo truck flies 3D printer to ISS: Clawdown in 3, 2...
Craft berths at space station with supplies, experiments, toys
That glass of water you just drank? It was OLDER than the SUN
One MEELLION years older. Some of it anyway
NASA rover Curiosity drills HOLE in MARS 'GOLF COURSE'
Joins 'traffic light' and perfect stony sphere on the Red Planet
Big dinosaur wowed females with its ENORMOUS HOOTER
That's right, Doris, I've got biggest snout in the prehistoric world
Japanese volcano eruption reportedly leaves 31 people presumed dead
Hopes fade of finding survivors on Mount Ontake
Canberra drone team dances a samba in Outback Challenge
CSIRO's 'missing bushwalker' found and watered
prev story

Whitepapers

A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
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?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.