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Primeur weekly 2019-12-02

Exascale supercomputing

LUMI supercomputer will arrive soon - CSC signed the Hosting Agreement with EuroHPC ...

The way is open to building world-class supercomputers in Europe ...

Crowd computing

Crowdsourced 'supercomputer' enables more localised and accurate rainfall forecasts ...

Quantum computing

Researchers reach milestone in quantum standardization ...

Ultrafast quantum simulations: A new twist to an old approach ...

Middleware

OpenNebula 5.10 "Boomerang" released ...

Hardware

Boston to continue HPC Roadshow in South Africa at the CHPC Conference ...

Fujitsu begins shipping supercomputer Fugaku ...

KISTI collaborates with Rescale to diversify R&D service of KISTI-5 supercomputer, Nurion ...

Applications

Rethinking brain-inspired computing from the atom up ...

Toward more efficient computing, with magnetic waves ...

A new theory for how black holes and neutron stars shine bright ...

Molecular eraser enables better data storage and computers for AI ...

Argonne and TAE Technologies heating up plasma energy research ...

IBM makes higher quality weather forecasts available worldwide ...

How the immune system gets on the wrong track ...

Pervasive Technology Institute and Cancer Computer join forces for cure ...

TOP500

CNES's Data Processing Centre increases capacity and reaches 15th place in IO500 world ranking ...

WekaIO places first on IO-500 Challenge ...

The Cloud

NetApp and Google Cloud advance strategic partnership to drive innovation in the Cloud ...

USFlash

Atos grows Santos Dumont supercomputer capacity fivefold making it largest in Latin America ...

Ultrafast quantum simulations: A new twist to an old approach

25 Nov 2019 Warwick - Billions of tiny interactions occur between thousands of particles in every piece of matter in the blink of an eye. Simulating these interactions in their full dynamics was said to be elusive but has now been made possible by new work of researchers from Oxford and Warwick.

In doing so, they have paved the way for new insights into the complex mutual interactions between the particles in extreme environments such as at the heart of large planets or laser nuclear fusion.

Researchers at the University of Warwick and University of Oxford have developed a new way to simulate quantum systems of many particles, that allows for the investigation of the dynamic properties of quantum systems fully coupled to slowly moving ions.

Effectively, they have made the simulation of the quantum electrons so fast that it could run extremely long without restrictions and the effect of their motion on the movement of the slow ions would be visible.

Reported in the journalScience Advances, it is based on a long-known alternative formulation of quantum mechanics (Bohm dynamics) which the scientists have now empowered to allow to study the dynamics of large quantum systems.

Many quantum phenomena have been studied for single or just a few interacting particles as large complex quantum systems overpower scientists' theoretical and computational capabilities to make predictions. This is complicated by the vast difference in timescale the different particle species act on: ions evolve thousands of times more slowly than electrons due to their larger mass. To overcome this problem, most methods involve decoupling electrons and ions and ignoring the dynamics of their interactions - but this severely limits our knowledge on quantum dynamics.

To develop a method that allows scientists to account for the full electron-ion interactions, the researchers revived an old alternative formulation of quantum mechanics developed by David Bohm. In quantum mechanics, one needs to know the wave function of a particle. It turns out that describing it by the mean trajectory and a phase, as done by David Bohm, is very advantageous. However, it took an additional suit of approximations and many tests to speed up the calculations as dramatic as required. Indeed, the new methods demonstrated an increase of speed by more than a factor of 10.000 (four orders of magnitude) yet is still consistent with previous calculations for static properties of quantum systems.

The new approach was then applied to a simulation of warm dense matter, a state between solids and hot plasmas, that is known for its inherent coupling of all particle types and the need for a quantum description. In such systems, both the electrons and the ions can have excitations in the form of waves and both waves will influence each other. Here, the new approach can show its strength and determined the influence of the quantum electrons on the waves of the classical ions while the static properties were proven to agree with previous data.

Many-body quantum systems are the core of many scientific problem ranging from the complex biochemistry in our bodies to the behaviour of matter inside of large planets or even technological challenges like high-temperature superconductivity or fusion energy which demonstrates the possible range of applications of the new approach.

Prof. Gianluca Gregori from Oxford, who led the investigation, stated: "Bohm quantum mechanics has often been treated with skepticism and controversy. In its original formulation, however, this is just a different reformulation of quantum mechanics. The advantage in employing this formalism is that different approximations become simpler to implement and this can increase the speed and accuracy of simulations involving many-body systems."

Dr. Dirk Gericke from the University of Warwick, who assisted the design of the new computer code, stated: "With this huge increase of numerical efficiency, it is now possible to follow the full dynamics of fully interacting electron-ion systems. This new approach thus opens new classes of problems for efficient solutions, in particular, where either the system is evolving or where the quantum dynamics of the electrons has a significant effect on the heavier ions or the entire system."

"This new numerical tool will be a great asset when designing and interpreting experiments on warm dense matter. From its results, and especially when combined with designated experiments, we can learn much about matter in large planets and for laser fusion research. However, I believe its true strength lies in its universality and possible applications in quantum chemistry or strongly driven solids."

B. Larder, D. O. Gericke, S. Richardson, P. Mabey, T. G. White, and G. Gregori are the authors of the paper titled " Fast nonadiabatic dynamics of many-body quantum systems ". The paper has been published inScience Advances5, eaaw1634 (2019) - DOI: 10.1126/sciadv.aaw1634.

Source: University of Warwick

Back to Table of contents

Primeur weekly 2019-12-02

Exascale supercomputing

LUMI supercomputer will arrive soon - CSC signed the Hosting Agreement with EuroHPC ...

The way is open to building world-class supercomputers in Europe ...

Crowd computing

Crowdsourced 'supercomputer' enables more localised and accurate rainfall forecasts ...

Quantum computing

Researchers reach milestone in quantum standardization ...

Ultrafast quantum simulations: A new twist to an old approach ...

Middleware

OpenNebula 5.10 "Boomerang" released ...

Hardware

Boston to continue HPC Roadshow in South Africa at the CHPC Conference ...

Fujitsu begins shipping supercomputer Fugaku ...

KISTI collaborates with Rescale to diversify R&D service of KISTI-5 supercomputer, Nurion ...

Applications

Rethinking brain-inspired computing from the atom up ...

Toward more efficient computing, with magnetic waves ...

A new theory for how black holes and neutron stars shine bright ...

Molecular eraser enables better data storage and computers for AI ...

Argonne and TAE Technologies heating up plasma energy research ...

IBM makes higher quality weather forecasts available worldwide ...

How the immune system gets on the wrong track ...

Pervasive Technology Institute and Cancer Computer join forces for cure ...

TOP500

CNES's Data Processing Centre increases capacity and reaches 15th place in IO500 world ranking ...

WekaIO places first on IO-500 Challenge ...

The Cloud

NetApp and Google Cloud advance strategic partnership to drive innovation in the Cloud ...

USFlash

Atos grows Santos Dumont supercomputer capacity fivefold making it largest in Latin America ...