Back to Table of contents

Primeur weekly 2015-03-30

Exascale supercomputing

PRACEdays15 to include EESI2 Final Conference, Women in HPC, and Enabling Exascale in Europe ...

The Cloud

HP delivers first fully-configured and integrated OpenStack and Cloud Foundry-based private Cloud ...

Desktop Grids

BOINC 7.4.42 released to the public ...

EuroFlash

Altair Engineering announces keynote speakers from Airbus, Jaguar Land Rover and Bloodhound SSC to present at the 9th UK Altair Technology Conference ...

UK Atomic Weapons Establishment awards SGI contract to support research with new SGI ICE XA systems ...

Cray to deliver five-petaflop supercomputer and high-performance storage system to Petroleum Geo-Services ...

Theory of the Strong Interaction verified - Supercomputer calculates mass difference between neutron and proton ...

Lenovo opens first global High Performance Computing innovation centre in Germany ...

A rehearsal space with musicians 2,700 kilometers apart from each other ...

A first glimpse inside a macroscopic quantum state ...

USFlash

Automotive, aerospace and defense take centre stage at the 2015 Americas Altair Technology Conference ...

Big Data allows computer engineers to find genetic clues in humans ...

SGI delivers cutting-edge supercomputer to the National Institute for Materials Science ...

Supercomputers give universities a competitive edge, researchers find ...

Engineers develop new methods to speed up simulations in computational grand challenge ...

Micron and Intel unveil new 3D NAND flash memory ...

India's National Supercomputing Mission (NSM): Building capacity and capability to be jointly implemented by the Department of Science and Technology and Department of Electronics and Information Technology ...

U.S. Army improves systems testing to deliver more capability to fight ...

Quantum compute this - WSU mathematicians build code to take on toughest of cyber attacks ...

IBM invests in Modernizing Medicine to accelerate adoption of Watson technologies in health care ...

Quantum correlation can imply causation ...

From programmable backbones to advanced 'apps': An end-to-end vision of the future Internet ...

Building shape inspires new material discovery ...

UW scientists build a nanolaser using a single atomic sheet ...

OpenPOWER Foundation technology leaders unveil hardware solutions to deliver new server alternatives ...

Quantum correlation can imply causation

23 Mar 2015 Waterloo - Contrary to the statistician's slogan, in the quantum world, certain kinds of correlations do imply causation. Research from the Institute for Quantum Computing (IQC) at the University of Waterloo and the Perimeter Institute for Theoretical Physics shows that in quantum mechanics, certain kinds of observations will let you distinguish whether there is a common cause or a cause-effect relation between two variables. The same is not true in classical physics.

Explaining the observed correlations among a number of variables in terms of underlying causal mechanisms, known as the problem of 'causal inference', is challenging but experts in field of machine learning have made significant progress in recent years physicists are now exploring how this problem appears in a quantum context.

Causal inference hinges on the distinction between correlation and causation. "If A and B are correlated, then when you learn about A, you update your knowledge of B - this is inference. If A causes B, then by manipulating A, you can control B - this is influence", stated Robert Spekkens, a faculty member at Perimeter Institute and the Department of Physics and Astronomy at Waterloo. "In quantum foundations, this distinction is key."

Knowing if a correlation arises from a cause-effect relation or a common cause relation is a fundamental problem in science. A prime example: drug trials. When physicians observe a correlation between treatment and recovery, they cannot presume that the treatment is the cause of the recovery. If men are more likely to choose the treatment and also more likely to recover spontaneously, regardless of treatment, then the correlation would be explained by a common cause.

That is why, when testing treatments, pharmaceutical companies intervene and randomly assign either the drug or a placebo to participants. This ensures that the treatment variable is statistically independent of any potential common causes. This is a general feature of classical statistics: one needs to intervene in order to determine whether the correlations are due to a cause-effect relation, a common cause relation, or a mix of both.

The paper, published inNature Physics, demonstrates that quantum effects can eliminate the need for intervention. "This research provides a new way to think about quantum mechanics", stated Professor Kevin Resch, Canada Research Chair in Optical Quantum Technologies in the Department of Physics and Astronomy. "It's also a really useful framework for thinking about foundational problems."

Robert Spekkens, along with PhD student Katja Ried and fellow theorist Dominik Janzing, considered the situation of an observer who is probing two variables and finds them to be correlated. The observer doesn't know whether this is because they are the input and output of a quantum process, that is, cause-effect related, or because they are the two halves of an entangled quantum state, and therefore correlated by a common cause. They realized that certain patterns of correlations are distinctive to each scenario.

Kevin Resch, together with his students Megan Agnew and Lydia Vermeyden, had the tools to put this idea to the test. They built a photonic circuit that could switch between the two scenarios proposed by the theorists, allowing them to vary the causal structure realized by the experiment.

Their results confirmed that the quantum effects of entanglement and coherence provide an advantage for causal inference. This parallels the way in which quantum effects can help to solve computational problems and make cryptography more secure. Thinking about which practical tasks are easier in a quantum world has traditionally led to many insights into its foundations.

The team describes their work as opening the door to answering questions such as: How can these techniques be generalized to scenarios involving more than two systems? Is the menu of possible causal relations between quantum systems larger than between classical systems? How should we understand causality in a quantum world?
Source: University of Waterloo

Back to Table of contents

Primeur weekly 2015-03-30

Exascale supercomputing

PRACEdays15 to include EESI2 Final Conference, Women in HPC, and Enabling Exascale in Europe ...

The Cloud

HP delivers first fully-configured and integrated OpenStack and Cloud Foundry-based private Cloud ...

Desktop Grids

BOINC 7.4.42 released to the public ...

EuroFlash

Altair Engineering announces keynote speakers from Airbus, Jaguar Land Rover and Bloodhound SSC to present at the 9th UK Altair Technology Conference ...

UK Atomic Weapons Establishment awards SGI contract to support research with new SGI ICE XA systems ...

Cray to deliver five-petaflop supercomputer and high-performance storage system to Petroleum Geo-Services ...

Theory of the Strong Interaction verified - Supercomputer calculates mass difference between neutron and proton ...

Lenovo opens first global High Performance Computing innovation centre in Germany ...

A rehearsal space with musicians 2,700 kilometers apart from each other ...

A first glimpse inside a macroscopic quantum state ...

USFlash

Automotive, aerospace and defense take centre stage at the 2015 Americas Altair Technology Conference ...

Big Data allows computer engineers to find genetic clues in humans ...

SGI delivers cutting-edge supercomputer to the National Institute for Materials Science ...

Supercomputers give universities a competitive edge, researchers find ...

Engineers develop new methods to speed up simulations in computational grand challenge ...

Micron and Intel unveil new 3D NAND flash memory ...

India's National Supercomputing Mission (NSM): Building capacity and capability to be jointly implemented by the Department of Science and Technology and Department of Electronics and Information Technology ...

U.S. Army improves systems testing to deliver more capability to fight ...

Quantum compute this - WSU mathematicians build code to take on toughest of cyber attacks ...

IBM invests in Modernizing Medicine to accelerate adoption of Watson technologies in health care ...

Quantum correlation can imply causation ...

From programmable backbones to advanced 'apps': An end-to-end vision of the future Internet ...

Building shape inspires new material discovery ...

UW scientists build a nanolaser using a single atomic sheet ...

OpenPOWER Foundation technology leaders unveil hardware solutions to deliver new server alternatives ...