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Primeur weekly 2013-09-23

Exascale supercomputing

Supercomputers for all: The next frontier for Europe's high performance computing ...

The Cloud

DataDirect Networks ushers in a new era of scale, speed and data insight for web-scale and Big Data applications ...

Cybersecurity researcher joins the ranks of the 'brilliant' ...

IBM commits $1 billion to fuel Linux and open source innovation on Power systems ...

Siemens plans North American HR technology Cloud migration to Oracle Fusion HCM with help from KPMG ...

HP announces Cloud-driven enhancements to application and catabase archiving solution ...

EuroFlash

AMS-IX starts new regional Internet exchange hub in Mombasa, Kenya, in collaboration with KIXP ...

Altair announces most successful UK technology event to date ...

Graphene photodetector integrated into computer chip ...

PRACE pre-commercial procurement of whole system design for energy efficient HPC ...

Severo Ochoa (SO) programme at Barcelona Supercomputing Center ...

Quantum entanglement only dependent upon area ...

University of Leicester hosts national supercomputing meeting, showcasing science from the smallest and largest scales ...

USFlash

Six vendors complete test event to become part of OpenFabrics Alliance Interoperability Logo Programme ...

OpenFabrics Alliance announces formation of OpenFramework Working Group ...

DataDirect Networks and ASG partner to offer a private Cloud solution for high performance, high availability archive and collaboration ...

DataDirect Networks to power business-critical broadcast system servicing for Starz ...

Connecting the future ...

$50 million NSF grant to advance cyberinfrastructure for Big Data in life sciences ...

Supercomputing the transition from ordinary to extraordinary forms of matter ...

Cray adds large memory and shared memory solutions to its line of Cray CS300 cluster supercomputers ...

On the road to fault-tolerant quantum computing ...

Bold idea for 'Big Data' ...

NASA uses supercomputer to create future climate projections for the United States ...

Supercomputer sheds weight, gains mobility, and becomes "Server-on-the-Go" ...

Graphene could yield cheaper optical chips ...

Scaling up personalized query results for next generation of search engines ...

Quantum entanglement only dependent upon area

15 Sep 2013 London - Two researchers at the University College London (UCL) Computer Science and the University of Gdansk present a new method for determining the amount of entanglement - a quantum phenomenon connecting two remote partners, and crucial for quantum technology - within part of a one-dimensional quantum system.

In their paper, published inNature Physics, Dr. Fernando Brandão, UCL Computer Science, and Dr. Michał Horodecki, Institute for Theoretical Physics and Astrophysics, University of Gdansk, demonstrate when the correlation between particles in a sample reduces exponentially with distance, the entanglement between one region and the rest of the sample only depends on the area of the boundary between them.

Characterising entangled states is essential for technologies such as quantum computation, quantum communication and quantum cryptography. Entanglement is also the difficulty behind making computer simulations of quantum systems. This finding shows that a large class of quantum systems - those with exponential decay of correlations - has only limited entanglement and so can be simulated easily.

The relationship between area and entanglement was suspected by researchers in this field based on the intuitive argument that if the correlation between particles in a system dropped off rapidly with distance, only nearby particles would be entangled with each other. Therefore, particles far away from a boundary would not participate in entanglement and only the boundary area would be relevant.

However, this tempting idea was undermined by the existence of a counterexample. This seemed to show that even when two regions could be separated by a layer wide enough to cut off nearly all correlation between them, observers would not be able to know as much about each region as they would if they were genuinely isolated. This 'data hiding' phenomenon is a key characteristic of entangled states, where a lack of knowledge of one partner affects what can be measured of the other.

This work resolves the apparent difficulty by combining recent findings from quantum information theory, originally developed for analyzing quantum communication protocols, showing that data hiding cannot hold once exponential decaying correlations are found in all different regions of the system.

Dr. Brandão stated: "We're very excited to have produced this method. It proves something that seemed to be intuitively true, but the reason why it is true has turned out to be quite different from the original intuition. The result also helps us identify cases where there is low entanglement. These are often good candidates for simulation using classical computers not capable of modelling the consequences of quantum phenomena."

Dr. Horodecki stated: "What I especially like about our result, is that, perhaps for the first time in this domain, we used solely information-theoretic techniques without assuming any specific physical properties of the system other than exponential decaying correlations. This makes the result very general."

The work is published on theNature Physicswebsite at http://dx.doi.org/10.1038/nphys2747 .
Source: University College London

Back to Table of contents

Primeur weekly 2013-09-23

Exascale supercomputing

Supercomputers for all: The next frontier for Europe's high performance computing ...

The Cloud

DataDirect Networks ushers in a new era of scale, speed and data insight for web-scale and Big Data applications ...

Cybersecurity researcher joins the ranks of the 'brilliant' ...

IBM commits $1 billion to fuel Linux and open source innovation on Power systems ...

Siemens plans North American HR technology Cloud migration to Oracle Fusion HCM with help from KPMG ...

HP announces Cloud-driven enhancements to application and catabase archiving solution ...

EuroFlash

AMS-IX starts new regional Internet exchange hub in Mombasa, Kenya, in collaboration with KIXP ...

Altair announces most successful UK technology event to date ...

Graphene photodetector integrated into computer chip ...

PRACE pre-commercial procurement of whole system design for energy efficient HPC ...

Severo Ochoa (SO) programme at Barcelona Supercomputing Center ...

Quantum entanglement only dependent upon area ...

University of Leicester hosts national supercomputing meeting, showcasing science from the smallest and largest scales ...

USFlash

Six vendors complete test event to become part of OpenFabrics Alliance Interoperability Logo Programme ...

OpenFabrics Alliance announces formation of OpenFramework Working Group ...

DataDirect Networks and ASG partner to offer a private Cloud solution for high performance, high availability archive and collaboration ...

DataDirect Networks to power business-critical broadcast system servicing for Starz ...

Connecting the future ...

$50 million NSF grant to advance cyberinfrastructure for Big Data in life sciences ...

Supercomputing the transition from ordinary to extraordinary forms of matter ...

Cray adds large memory and shared memory solutions to its line of Cray CS300 cluster supercomputers ...

On the road to fault-tolerant quantum computing ...

Bold idea for 'Big Data' ...

NASA uses supercomputer to create future climate projections for the United States ...

Supercomputer sheds weight, gains mobility, and becomes "Server-on-the-Go" ...

Graphene could yield cheaper optical chips ...

Scaling up personalized query results for next generation of search engines ...