Subscribe free to our newsletters via your
. 24/7 Space News .




Subscribe free to our newsletters via your




















NANO TECH
'Nano-hashtags' could provide definite proof of Majorana particles
by Staff Writers
Eindhoven, Netherlands (SPX) Aug 28, 2017


Scanning electron microscope image of growing InP nanowires thereby forming multiple junctions.

In Nature an international team of researchers from Eindhoven University of Technology, Delft University of Technology and the University of California - Santa Barbara presents an advanced quantum chip that will be able to provide definitive proof of the mysterious Majorana particles. These particles, first demonstrated in 2012, are their own antiparticle at one and the same time. The chip, which comprises ultrathin networks of nanowires in the shape of 'hashtags', has all the qualities to allow Majorana particles to exchange places. This feature is regarded as the smoking gun for proving their existence and is a crucial step towards their use as a building block for future quantum computers.

In 2012 it was big news: researchers from Delft University of Technology and Eindhoven University of Technology presented the first experimental signatures for the existence of the Majorana fermion. This particle had been predicted in 1937 by the Italian physicist Ettore Majorana and has the distinctive property of also being its own anti-particle. The Majorana particles emerge at the ends of a semiconductor wire, when in contact with a superconductor material.

While the discovered particles may have properties typical to Majoranas, the most exciting proof could be obtained by allowing two Majorana particles to exchange places, or 'braid' as it is scientifically known. "That's the smoking gun," suggests Erik Bakkers, one of the researchers from Eindhoven University of Technology. "The behavior we then see could be the most conclusive evidence yet of Majoranas."

In the Nature paper that published last week, Bakkers and his colleagues present a new device that should be able to show this exchanging of Majoranas. In the original experiment in 2012 two Majorana particles were found in a single wire but they were not able to pass each other without immediately destroying the other. Thus the researchers quite literally had to create space. In the presented experiment they formed intersections using the same kinds of nanowire so that four of these intersections form a 'hashtag', #, and thus create a closed circuit along which Majoranas are able to move.

The researchers built their hashtag device starting from scratch. The nanowires are grown from a specially etched substrate such that they form exactly the desired network which they then expose to a stream of aluminium particles, creating layers of aluminium, a superconductor, on specific spots on the wires - the contacts where the Majorana particles emerge. Places that lie 'in the shadow' of other wires stay uncovered.

The entire process happens in a vacuum and at ultra-cold temperature (around -273 degree Celsius). "This ensures very clean, pure contacts," says Bakkers, "and enables us to make a considerable leap in the quality of this kind of quantum device." The measurements demonstrate for a number of electronic and magnetic properties that all the ingredients are present for the Majoranas to braid.

If the researchers succeed in enabling the Majorana particles to braid, they will at once have killed two birds with one stone. Given their robustness, Majoranas are regarded as the ideal building block for future quantum computers that will be able to perform many calculations simultaneously and thus many times faster than current computers. The braiding of two Majorana particles could form the basis for a qubit, the calculation unit of these computers.

An interesting detail is that the samples have traveled around the world during the fabrication, combining unique and synergetic activities of each research institution. It started in Delft with patterning and etching the substrate, then to Eindhoven for nanowire growth and to Santa Barbara for aluminium contact formation. Finally back to Delft via Eindhoven for the measurements.

The article in Nature is entitled 'Epitaxy of Advanced Nanowire Quantum Devices'. The authors are (1: Eindhoven University of Technology, 2: TU Delft, 3: University of California - Santa Barbara, 4: TNO, 5: Niels Bohr Institute (Copenhagen), 6: Philips Innovation Services Eindhoven, 7: Microsoft Station-Q Delft).

NANO TECH
What the world's tiniest 'monster truck' reveals
Washington DC (SPX) Aug 28, 2017
The world's shortest race by distance - a fraction of the width of a human hair - was run on gold and silver tracks, and took a whopping 30 hours. Given that the vehicles were invisible to the naked eye, your typical racing fan might have missed it. But the April "nanorace" was a huge success for scientists working at the nanoscale. It spurred interest in molecular machines and led to a surprisi ... read more

Related Links
Eindhoven University of Technology
Nano Technology News From SpaceMart.com
Computer Chip Architecture, Technology and Manufacture

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

NANO TECH
Three astronauts blast off for five-month ISS mission

What's hot and what's not at Berlin's IFA tech fair

'Star Trek' actor Shatner sends message to Voyager

ESA retrieves NASA astronauts with new procedure in wake of hurricane

NANO TECH
Rocket fever launches UB students to engineering competition in New Mexico

Kacific selects SpaceX to provide launch service

ISRO suspects pyro elements failed to separate rocket's heat shield

Ariane 5 rocket aborts Guiana lift-off in final seconds

NANO TECH
45 Kilometers on the Odometry for Opportunity

Discovery of boron on Mars adds to evidence for habitability

Life on Mars: Let's Try Oman Desert First for Space Mission

For Moratorium on Sending Commands to Mars, Blame the Sun

NANO TECH
China, Russia to Have Smooth Space Cooperation, Says Expert

Kuaizhou-11 to send six satellites into space

Russia, China May Sign 5-Year Agreement on Joint Space Exploration

ESA and Chinese astronauts train together

NANO TECH
ASTROSCALE Raises a Total of $25 Million in Series C Led by Private Companies

LISA Pathfinder: bake, rattle and roll

Bids for government funding prove strong interest in LaunchUK

Blue Sky Network Reaffirms Commitment to Brazilian Market

NANO TECH
New tools for exploring the surface of Mars

192 Indian space objects currently in orbit

Molecules move faster near sticky surfaces

Europe's biggest X-ray laser begins operations

NANO TECH
Climate change for aliens

X-Rays Reveal Temperament of Possible Planet-Hosting Stars

X-rays Reveal Temperament of Possible Planet-hosting Stars

Could TRAPPIST-1's Seven Earth-size Planets Have Gas Giant Siblings

NANO TECH
Jupiter's Auroras Present a Powerful Mystery

Pluto features given first official names

Juno Scientists Prepare for Seventh Science Pass of Jupiter

New Horizons Files Flight Plan for 2019 Flyby




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement