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Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...

Majorana runners go long range: New topological phases of matter unveiled

26 Feb 2018 Madrid - Researchers from Universidad Complutense de Madrid, MIT and Harvard University have discovered a mechanism that enhances the presence of Majorana particles at the edges of a topological superconductor, thanks to the presence of long-range magnetic interactions. Moreover, they have shown that it is possible to find new topological phases of matter by merging distant Majoranas into a new particle. This great achievement could have future applications for quantum technologies.

In a recent paper published inPhysical Review Letters, these researchers explain how they improve the propagation of Majorana particles at the edge of a topological superconductor by exploring the nature of long-range interactions, and transforming the Majoranas into more stable quasi-particles.

The study of topological phases of matter has become a very active field of research, that is revolutionizing our understanding of nature. It has given rise to new materials like topological insulators, Weyl semimetals, and topological superconductors.

Topological superconductors are materials that, besides conducting electric current without dissipating energy as heat, they host unconventional particles known as Majorana fermions. It is unknown whether these particles exist in high energy physics, but remarkably, Majorana fermions appear as low energy excitations (quasi-particles) in certain materials.

These particles are very exotic in condensed matter. They behave as their own antiparticle and have been proposed as building blocks of future topological quantum computers. A quantum computer uses certain remarkable properties of quantum physics to solve tasks and processes, that would otherwise be unsurmountable by conventional computers.

Nonetheless, these properties - such as quantum entanglement between tiny particles - are very sensitive to environmental interactions (decoherence). This is the main reason why the construction of quantum computers turns out to be a great challenge that is currently being tackled by research labs and companies all over the world. The Majorana fermions that appear in topological superconductors are much more robust than other conventional particles, which would allow to build such novel computers.

The existence of Majorana fermions had been already proven in earlier works: chains of magnetic impurities placed on top of a superconductor substrate have shown that long-range magnetic interactions between electrons appear very naturally in these materials.

According to the authors of this publication, these interactions are very similar to the one between two magnets that feel attraction or repulsion to one another. In this case, it would be the magnetic moments of the electrons that interact with each other instead of the magnets.

However, it remained unknown what the effect of these magnetic interactions was over the properties of superconducting materials. This is precisely what this research work has solved.

The researchers of this collaboration have found cases where the long-range effects of the magnetic interactions were so strong, that two distant Majorana fermions merged into a non-local topological quasi-particle.

This surprising effect could be used to store quantum information in a non-degenerate system - i.e. two-level systems with different energy), but with extra protection against external noise, caused by decoherence, or the loss of quantum effects.

These findings represent a great leap towards the understanding of the role of long-range magnetic interactions in the realm of topological superconductors. Moreover, these results will spark generation of novel topological phases of mater, widening their current applications in spintronics, quantum memories and computers, and other related fields.

The paper titled " Chiral Topological Superconductors Enhanced by Long-Range Interactions " was authored by O. Viyuela, L. Fu, and M. A. Martin-Delgado. It has appeared inPhysical Review Letters120, 017001 (2018).
Source: QUITEMAD+

Back to Table of contents

Primeur weekly 2018-03-05

Quantum computing

Want more efficient simulators? Store time in a quantum superposition ...

Experimentally demonstrated a toffoli gate in a semiconductor three-qubit system ...

Individual quantum dots imaged in 3D for first time ...

Artificial intelligence techniques reconstruct mysteries of quantum systems ...

Majorana runners go long range: New topological phases of matter unveiled ...

Focus on Europe

University of Groningen to organize Second Information Universe Conference ...

IEEE eScience 2018 calls for contributions ...

Harvey Meyer is awarded an ERC Consolidator Grant for fundamental calculations on strong interaction effects ...

BSC presents SuperGeek, a mascot to bring supercomputers closer to the youngest ...

Call for Participation to European Forum about "Shaping Europe's Digital Future - HPC for Extreme Scale Scientific and Industrial Applications" ...

Data management and computing infrastructure procurement broadly serves Finnish research ...

Hardware

High demand from commercial customers to boost growth in global supercomputer market ...

OCF deploys UK academia's first IBM POWER9 systems ...

Niagara is Canada's most powerful research supercomputer fuelling Canadian innovation and discovery ...

CENIC recognizes UCSC's Hyades supercomputer cluster connection ...

CoolIT Systems reports 60% revenue growth in 2017 ...

SPEC offers HPG benchmarks free of charge to qualified non-profit organisations worldwide ...

Applications

Supercomputer model reveals how sticky tape makes graphene ...

Concertio launches Optimizer Studio to help performance engineers and IT professionals achieve peak system performance ...

Sandia researcher Jacqueline Chen elected to National Academy of Engineering ...

Oak Ridge National Laboratory uses supercomputers to simulate radiation transport and to understand the dynamic interactions among ions, solids and liquids ...

Mining hardware helps scientists gain insight into silicon nanoparticles ...

Can strongly lensed type 1a supernovae resolve cosmology's biggest controversy? ...

Give your research a boost at the SURF Research Bootcamp ...

TOP500

Supercomputing under a new lens: A Sandia-developed benchmark re-ranks top computers ...

The Cloud

Alibaba Cloud launches Cloud and AI solutions in Europe including bare metal HPC services ...

KIT helps build the European Open Science Cloud ...