New record in quantum communications

August 30, 2012
New record in quantum communications
Dr Boris Hage, Mr Seiji Armstrong, Professor Hans Bachor, Dr Jiri Janousek, Dr Katherine Wagner and Dr Jean-Francois Morizur.

(—Researchers from The Australian National University have taken a quantum leap towards developing the next-generation super-fast networks needed to drive future computing.

Mr Seiji Armstrong, a PhD researcher from the Department of in the ANU College of Physical and Mathematical Sciences, has led a team which has developed a technique that allows for to travel at higher bandwidth using a beam of light and the phenomenon called entanglement. Mr Armstrong's research is published in Nature Communications.

"Broadly speaking, entanglement is when two things are correlated in some way so that by measuring one of them, you can infer information about the other. It is important because without it, it's impossible to teleport quantum information," said Mr Armstrong.

"This quirk was discovered by Einstein in 1935 and from the late 1980s people started suggesting that entanglement might be useful for processing information. It turned out that by encoding information into systems that are entangled you can perform computations that are unfeasible for ordinary computers.

"The problem is we realised that entanglement experiments around the world were getting very complicated. Each entangled mode of light required its own laser beam, as well as a whole range of other equipment. Given that a quantum computer would need hundreds or thousands of entangled states of light, this was impossibly complicated."

Mr Armstrong said that their research dramatically simplified this process.

"We were able to entangle eight quantum modes of light within one laser beam, a practice that used to require eight separate beams," he said.

"Our research is also a world first, as the previous best entanglement was four modes of light in the one laser in 2011. Our research shows that it is now possible to create a light beam with relatively a lot of quantum information on it. "

Explore further: A solid case of entanglement

Related Stories

A solid case of entanglement

January 11, 2010

Physicists have finally managed to demonstrate quantum entanglement of spatially separated electrons in solid state circuitry.

Quantum memory for communication networks of the future

November 8, 2010

Researchers from the Niels Bohr Institute at the University of Copenhagen have succeeded in storing quantum information using two 'entangled' light beams. Quantum memory or information storage is a necessary element of future ...

Large scale qubit generation for quantum computing

July 27, 2011

( -- "Many people are trying to build a quantum computer," Olivier Pfister tells "One to the problems, though, is that you need hundreds of thousands of qubits. So far, scalability has been something ...

Quantum optical link sets new time records

August 17, 2011

Quantum communication could be an option for the absolutely secure transfer of data. The key component in quantum communication over long distances is the special phenomenon called entanglement between two atomic systems. ...

Discord strikes the right quantum note

August 6, 2012

( -- Scientists have taken a quantum leap forward towards future computing after discovering that ‘background interference’ in quantum-level measurements, may be the very thing they need to unlock the potential ...

Recommended for you

Perfectly accurate clocks turn out to be impossible

October 7, 2015

Can the passage of time be measured precisely, always and everywhere? The answer will upset many watchmakers. A team of physicists from the universities of Warsaw and Nottingham have just shown that when we are dealing with ...

The topolariton, a new half-matter, half-light particle

October 7, 2015

A new type of "quasiparticle" theorized by Caltech's Gil Refael, a professor of theoretical physics and condensed matter theory, could help improve the efficiency of a wide range of photonic devices—technologies, such as ...

Fusion reactors 'economically viable' say experts

October 2, 2015

Fusion reactors could become an economically viable means of generating electricity within a few decades, and policy makers should start planning to build them as a replacement for conventional nuclear power stations, according ...

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

1 / 5 (2) Aug 31, 2012
"Broadly speaking, entanglement is when two things are correlated in some way so that by measuring one of them, you can infer information about the other. It is important because without it, it's impossible to teleport quantum information," said Mr Armstrong.

By the way, it is interesting to note that physicists still not know how the entanglement works! May be it was misinterpreted, because we also do not know the mechanism of quantum mechanics in which it was based. This physical mechanism view of quantum mechanics below may help to understand the situation.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.