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Primeur weekly 2014-12-22

Focus

SimScale engineering simulation platform is perfectly running in a web browser now ...

EuroFlash

RSC Group has entered in the Top10 of the world leading supercomputer vendors by TOP500 list ...

ISC High Performance introduces workshops in 2015 ...

ADVA Optical Networking transforms fiber access networks with new Access Link Monitoring solution ...

Telindus Telecom deploys ADVA Optical Networking's encryption technology to secure operator network and Cloud services ...

Institute of Aircraft Design at the University of Stuttgart selects Bright Cluster Manager for its HPC data centre ...

Imec partners with Huawei on high-bandwidth optical data link technology ...

Six new projects enabling scientific discovery to start in 2015 ...

ENTRA: Better software cuts computer energy use ...

USFlash

Cray awarded $30 million contract from the Department of Defense High Performance Computing Modernization Programme ...

High Performance Computing Modernization Programme (HPCMP) doubles capabilities ...

Ancient wisdom boosts sustainability of biotech cotton ...

Compute Canada attracts High Performance Computing talent to lead upgrades to the national advanced research platform ...

Pacific Northwest National Laboratory a major contributor to Washington state economy ...

U.S. Department of Veterans Affairs taps IBM Watson to help accelerate and enhance care delivery ...

More than 100 teams expected for ASC15, road-showed at Melbourne and Nanjing ...

Stanford team combines logic, memory to build a 'high-rise' chip ...

Tulane has one of the world's fastest computers ...

Funding ended for University of California High-Performance AstroComputing Center ...

Simulations at NERSC help illuminate attosecond laser experiment findings ...

Riding a 100G InfiniBand backbone, InfiniCortex, the Intercontinental Supercomputing Architecture, debuts in New Orleans ...

Quantum physics just got less complicated ...

Switching to spintronics ...

Lasers, multiple languages support and more with wysiwyg R34 ...

Quantum physics just got less complicated

19 Dec 2014 Singapore - Here's a nice surprise: quantum physics is less complicated than we thought. An international team of researchers has proved that two peculiar features of the quantum world previously considered distinct are different manifestations of the same thing. The result has been published 19 December inNature Communications.

Patrick Coles, Jedrzej Kaniewski, and Stephanie Wehner made the breakthrough while at the Centre for Quantum Technologies at the National University of Singapore. They found that 'wave-particle duality' is simply the quantum 'uncertainty principle' in disguise, reducing two mysteries to one.

"The connection between uncertainty and wave-particle duality comes out very naturally when you consider them as questions about what information you can gain about a system. Our result highlights the power of thinking about physics from the perspective of information", stated Stephanie Wehner, who is now an Associate Professor at QuTech at the Delft University of Technology in the Netherlands.

The discovery deepens our understanding of quantum physics and could prompt ideas for new applications of wave-particle duality.

Wave-particle duality is the idea that a quantum object can behave like a wave, but that the wave behaviour disappears if you try to locate the object. It's most simply seen in a double slit experiment, where single particles, electrons, say, are fired one by one at a screen containing two narrow slits. The particles pile up behind the slits not in two heaps as classical objects would, but in a stripy pattern like you'd expect for waves interfering. At least this is what happens until you sneak a look at which slit a particle goes through - do that and the interference pattern vanishes.

The quantum uncertainty principle is the idea that it's impossible to know certain pairs of things about a quantum particle at once. For example, the more precisely you know the position of an atom, the less precisely you can know the speed with which it's moving. It's a limit on the fundamental knowability of nature, not a statement on measurement skill. The new work shows that how much you can learn about the wave versus the particle behaviour of a system is constrained in exactly the same way.

Wave-particle duality and uncertainty have been fundamental concepts in quantum physics since the early 1900s. "We were guided by a gut feeling, and only a gut feeling, that there should be a connection", stated Patrick Coles, who is now a Postdoctoral Fellow at the Institute for Quantum Computing in Waterloo, Canada.

It's possible to write equations that capture how much can be learned about pairs of properties that are affected by the uncertainty principle. Patrick Coles, Jedrzej Kaniewski and Stephanie Wehner are experts in a form of such equations known as 'entropic uncertainty relations', and they discovered that all the maths previously used to describe wave-particle duality could be reformulated in terms of these relations.

"It was like we had discovered the 'Rosetta Stone' that connected two different languages", stated Patrick Coles. "The literature on wave-particle duality was like hieroglyphics that we could now translate into our native tongue. We had several eureka moments when we finally understood what people had done", he stated.

Because the entropic uncertainty relations used in their translation have also been used in proving the security of quantum cryptography - schemes for secure communication using quantum particles - the researchers suggest the work could help inspire new cryptography protocols.

In earlier papers, Stephanie Wehner and collaborators found connections between the uncertainty principle and other physics, namely quantum 'non-locality' and the second law of thermodynamics. The tantalising next goal for the researchers is to think about how these pieces fit together and what bigger picture that paints of how nature is constructed.

The paper titled "Equivalence of wave-particle duality to entropic uncertainty" appeared inNature Communications- doi:10.1038/ncomm6814 (2014). The preprint is available at http://arxiv.org/abs/1403.4687 .

Source: National University of Singapore

Back to Table of contents

Primeur weekly 2014-12-22

Focus

SimScale engineering simulation platform is perfectly running in a web browser now ...

EuroFlash

RSC Group has entered in the Top10 of the world leading supercomputer vendors by TOP500 list ...

ISC High Performance introduces workshops in 2015 ...

ADVA Optical Networking transforms fiber access networks with new Access Link Monitoring solution ...

Telindus Telecom deploys ADVA Optical Networking's encryption technology to secure operator network and Cloud services ...

Institute of Aircraft Design at the University of Stuttgart selects Bright Cluster Manager for its HPC data centre ...

Imec partners with Huawei on high-bandwidth optical data link technology ...

Six new projects enabling scientific discovery to start in 2015 ...

ENTRA: Better software cuts computer energy use ...

USFlash

Cray awarded $30 million contract from the Department of Defense High Performance Computing Modernization Programme ...

High Performance Computing Modernization Programme (HPCMP) doubles capabilities ...

Ancient wisdom boosts sustainability of biotech cotton ...

Compute Canada attracts High Performance Computing talent to lead upgrades to the national advanced research platform ...

Pacific Northwest National Laboratory a major contributor to Washington state economy ...

U.S. Department of Veterans Affairs taps IBM Watson to help accelerate and enhance care delivery ...

More than 100 teams expected for ASC15, road-showed at Melbourne and Nanjing ...

Stanford team combines logic, memory to build a 'high-rise' chip ...

Tulane has one of the world's fastest computers ...

Funding ended for University of California High-Performance AstroComputing Center ...

Simulations at NERSC help illuminate attosecond laser experiment findings ...

Riding a 100G InfiniBand backbone, InfiniCortex, the Intercontinental Supercomputing Architecture, debuts in New Orleans ...

Quantum physics just got less complicated ...

Switching to spintronics ...

Lasers, multiple languages support and more with wysiwyg R34 ...