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Primeur weekly 2017-04-10

Exascale supercomputing

EUROSERVER paves the way for low-power data centres ...

Intersect360 Research to provide USCC testimony for China's Pursuit of Next Frontier Tech hearing ...

Quantum computing

'Virtual' interferometers may overcome scale issues for optical quantum computers ...

Quantum-physical model system ...

Optics advance quantum information processing ...

Focus on Europe

A glance into the ISC 2017 Research Paper Session ...

OCF announce Iceotope as liquid cooling partner for research and academic market ...

Return of the mini-supercomputer in the Netherlands: Little Green Machine II ...

Max Planck Institute for Biophysical Chemistry chooses vSMP Foundation ...

PRACE opens SHAPE 5th Call for Proposals ...

IBM invests to accelerate innovation, collaboration and fast-track health care solutions in Finland ...

73% of academics say access to research data helps them in their work; 34% do not publish their data ...

Middleware

DDN Lustre powers University of Edinburgh accelerated genomics research ...

Hardware

Supercomputer growth drives record HPC revenue in 2016, Hyperion Research reports ...

Canada's most powerful academic supercomputer will launch at Simon Fraser University ...

Silicon Mechanics Announces Recipient of 6th Annual Research Cluster Grant ...

U.S. businesses risk falling behind as lead in global semiconductor industry threatened ...

Fujitsu and Oracle launch Fujitsu SPARC M12 servers with world's fastest per-core performance ...

IBM Researchers advance the understanding of chip reliability at IEEE International Reliability Physics Symposium ...

Applications

Artificial intelligence: Bosch and University of Amsterdam to cooperate closely ...

Cyber gene network could speed up discoveries ...

How can network analysis lead to a new way of studying court decisions? ...

IBM patents machine learning models for drug discovery ...

Clemson scientists receive $2.95 million to improve and simplify large-scale data analysis ...

New brain-inspired cybersecurity system detects 'bad apples' 100 times faster ...

Supercomputers reveal how cell membranes keep cancer-causing proteins turned off ...

The Cloud

IBM opens Budapest Software Lab to develop Cloud Video solutions ...

IBM first to deliver latest NVIDIA GPU accelerator on the Cloud to speed AI workloads ...

University of Wyoming uses Oracle Cloud to drive core mission of teaching, research, and service ...

Industry experts discuss advantages and risks of shifting data analytics to the Cloud ...

Quantum-physical model system


Schematic representation of the filling process: atoms from the external potential wells (represented by the yellow balls) move to the middle well as indicated by the red arrows. Illustration: David Fischer.
6 Apr 2017 Heidelberg - Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment with ultracold atoms. Using computer-assisted methods, Prof. Dr Sandro Wimberger and David Fischer from the Institute for Theoretical Physics discovered physical laws that point to the universal properties of this system. Their results were published in the journalAnnalen der Physik.

Under certain conditions, small particles follow completely different physical laws than those we are accustomed to. "Observing such quantum-physical phenomena, however, is sometimes difficult and requires working with small and isolated systems and to investigate those. But perfect isolation from the environment is never possible, so external influences can easily destroy the fragile state of the quantum system", explained primary author David Fischer, a student of physics at Heidelberg University. For experiments in this field, keeping such disruptions under control is of great interest. "This control enables us not only to ensure the coherence of the system, but it can also be used selectively to effect special conditions", emphasised Prof. Wimberger.

Ultracold atoms filled into so-called potential wells have proven to be suitable test objects in many experiments. A special laser configuration is used to generate a barrier that locks the atoms in a small area. If multiple wells are then brought close enough together, the atoms have the ability to "tunnel" from one well into an adjacent one. They are still trapped in the wells, but can move from one well to another, according to the Heidelberg physicists. The temperature of the atoms, which is only just above absolute zero at -273.15 degrees Celsius, favours this quantum-mechanical behaviour.

In developing their model system, David Fischer and Sandro Wimberger reproduced an experiment carried out at the Technical University of Kaiserslautern. There, the behaviour of cold atoms in a chain of potential wells was investigated. The researchers filled the chain with atoms, emptied the middle well, and watched it refill with atoms from the other wells. "The results of this study suggest that decoherence, i.e. external interference, plays a critical role in this process. What is unclear is which microscopic processes the quantum system uses to interact with the environment", stated David Fischer.

In their computer-assisted simulation of the refilling process, the two Heidelberg researchers tested various hypotheses and explored which processes actually influenced the behaviour of the model system. Among other things, they noticed that the time required for the refilling process varied based on the system parameters. This duration follows a power law, depending on the decoherence rate specified by the researchers. “In physics, this is often a sign of a universal behaviour of the system that is valid for all scales, hence simplifying the overall problem", stated Prof. Wimberger.

D. Fischer and S. Wimberger are the authors of the paper titled "Models for a multimode bosonic tunneling junction", published inAnnalen der Physik2017, and published online 13 February 2017, doi: 10.1002/andp.201600327.

Source: Heidelberg University

Back to Table of contents

Primeur weekly 2017-04-10

Exascale supercomputing

EUROSERVER paves the way for low-power data centres ...

Intersect360 Research to provide USCC testimony for China's Pursuit of Next Frontier Tech hearing ...

Quantum computing

'Virtual' interferometers may overcome scale issues for optical quantum computers ...

Quantum-physical model system ...

Optics advance quantum information processing ...

Focus on Europe

A glance into the ISC 2017 Research Paper Session ...

OCF announce Iceotope as liquid cooling partner for research and academic market ...

Return of the mini-supercomputer in the Netherlands: Little Green Machine II ...

Max Planck Institute for Biophysical Chemistry chooses vSMP Foundation ...

PRACE opens SHAPE 5th Call for Proposals ...

IBM invests to accelerate innovation, collaboration and fast-track health care solutions in Finland ...

73% of academics say access to research data helps them in their work; 34% do not publish their data ...

Middleware

DDN Lustre powers University of Edinburgh accelerated genomics research ...

Hardware

Supercomputer growth drives record HPC revenue in 2016, Hyperion Research reports ...

Canada's most powerful academic supercomputer will launch at Simon Fraser University ...

Silicon Mechanics Announces Recipient of 6th Annual Research Cluster Grant ...

U.S. businesses risk falling behind as lead in global semiconductor industry threatened ...

Fujitsu and Oracle launch Fujitsu SPARC M12 servers with world's fastest per-core performance ...

IBM Researchers advance the understanding of chip reliability at IEEE International Reliability Physics Symposium ...

Applications

Artificial intelligence: Bosch and University of Amsterdam to cooperate closely ...

Cyber gene network could speed up discoveries ...

How can network analysis lead to a new way of studying court decisions? ...

IBM patents machine learning models for drug discovery ...

Clemson scientists receive $2.95 million to improve and simplify large-scale data analysis ...

New brain-inspired cybersecurity system detects 'bad apples' 100 times faster ...

Supercomputers reveal how cell membranes keep cancer-causing proteins turned off ...

The Cloud

IBM opens Budapest Software Lab to develop Cloud Video solutions ...

IBM first to deliver latest NVIDIA GPU accelerator on the Cloud to speed AI workloads ...

University of Wyoming uses Oracle Cloud to drive core mission of teaching, research, and service ...

Industry experts discuss advantages and risks of shifting data analytics to the Cloud ...