The quantum revolution is a step closer

The quantum revolution is a step closer
Dr Austin Lund (left) and Dr Anthony Laing, co-authors of the research Dr Austin Lund (left) and Dr Anthony Laing, co-authors of the research

A new way to run a quantum algorithm using much simpler methods than previously thought has been discovered by a team of researchers at the University of Bristol. These findings could dramatically bring forward the development of a 'quantum computer' capable of beating a conventional computer.

Theories show how computing devices that operate according to can solve problems that conventional (classical) computers, including super computers, can never solve. These theories have been experimentally tested for small-scale quantum systems, but the world is waiting for the first definitive demonstration of a quantum device that beats a classical computer.

Now, researchers from the Centre for Quantum Photonics (CQP) at the University of Bristol together with collaborators from the University of Queensland (UQ) and Imperial College London have increased the likelihood of such a demonstration in the near term by discovering a new way to run a quantum algorithm with much simpler methods than previously thought.

The first definitive defeat for a classical computer could be achieved with a that runs an algorithm known as Boson Sampling, recently developed by researchers at MIT.

Boson Sampling uses single photons of light and optical circuits to take samples from an exponentially large probability distribution, which has been proven to be extremely difficult for .

Unlike other quantum algorithms, Boson Sampling has the benefit of being practical for near-term implementations, with the only experimental drawback being the difficulty of generating the dozens of single photons required for the important quantum victory.

However, the Bristol-UQ-Imperial researchers have found that the Boson Sampling algorithm can still be proven to be hard for classical computers when using standard probabilistic methods to generate single photons.

Dr Anthony Laing who led the CQP elements of the research said: "We realised we could chain together many standard two-photon sources in such a way as to give a dramatic boost to the number of photons generated."

Dr Austin Lund from UQ and currently on sabbatical in CQP added: "Once we had the idea for the boosted source, we needed to prove that it could solve a version of the Boson Sampling . We hope that the last major experimental hurdle has now been overcome."

The research is published this week in Physical Review Letters.


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More information: 'Boson Sampling from a Gaussian State' by A.-P. Lund, A. Laing, S. Rahimi-Keshari, T. Rudolph, J.-L. O'Brien, and T.-C. Ralph in Phys. Rev. Lett. 113, 100502. journals.aps.org/prl/abstract/ … ysRevLett.113.100502
Journal information: Physical Review Letters

Citation: The quantum revolution is a step closer (2014, September 11) retrieved 22 April 2019 from https://phys.org/news/2014-09-quantum-revolution-closer.html
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Sep 11, 2014
Other approaches will advance as well.

Sep 11, 2014
Using a photon? I'm sure Heisenberg will have something to say about that uncertainty.

Sep 11, 2014
This comment has been removed by a moderator.

Sep 11, 2014
I like busum sampling, it's one of my favorite pastimes

Sep 11, 2014
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Sep 12, 2014
The concept of transporting an atom via a computer chip is awesome, however; humans do possess the ability to control their own energy via junk DNA. The closer these computers get to being human the more possibility of entanglement that may need the security and direction of the quantum police.
This is an entirely new perception in an entirely new world.
Or, is it?

Sep 14, 2014
this is tabloid science. They are after all in the business of making money selling articles about experiments
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