. Space Travel News .




.
CHIP TECH
A new kind of quantum junction
by Staff Writers
Tokyo, Japan (SPX) Apr 24, 2012

A superconducting loop is inserted with thin superconducting wire. Credit: RIKEN.

A new type of quantum bit called a "phase-slip qubit", devised by researchers at the RIKEN Advanced Science Institute and their collaborators, has enabled the world's first-ever experimental demonstration of coherent quantum phase slip (CQPS).

The groundbreaking result sheds light on an elusive phenomenon whose existence, a natural outcome of the hundred-year-old theory of superconductivity, has long been speculated, but never actually observed.

Superconductivity describes a phenomenon in which electrons pass through certain types of materials without any resistance when cooled below a given temperature. Among the most important applications of superconductivity is the Josephson junction, named after physicist Brian Josephson, who in 1962 predicted that a superconducting current could tunnel between superconductors separated by a thin insulating layer.

This phenomenon, the Josephson effect, has been applied in a variety of areas including magnetometer design, voltage standardization, and quantum computing.

Researchers have long known of an intriguing theoretical parallel to the Josephson effect in which insulator and superconductor are reversed: rather than electric charges jumping from one superconducting layer to another across an insulating layer, magnetic flux quanta jump from one insulator to another across a superconducting layer.

Quantum tunneling of electrons in the Josephson junction is replaced in this parallel by the coherent "slip" of the phase, a quantum variable that, in superconducting circuits, plays a dual role to that of electric charge.

Coherent quantum phase slip (CQPS), as this phenomenon is known, has long been limited to theory-but no more. In a paper in Nature, Oleg Astafiev and colleagues at the RIKEN Advanced Science Institute (ASI) and NEC Smart Energy Research Laboratories report on the first direct observation of CQPS in a narrow superconducting wire of indium-oxide (InOx).

The wire is inserted into a larger superconducting loop to form a new device called a phase-slip qubit, with the superconducting layer (the thin wire) sandwiched between insulating layers of empty space.

By tuning the magnetic flux penetrating this loop while scanning microwave frequencies, the researchers detected a band gap in the energy curves for the two flux states of the system (Figure 3), just as theory predicts.

This gap is a result of quantum mechanics, which prevents the two states from occupying the same energy level, forcing them to tunnel across the superconducting layer-and through a quantum phase-slip in the narrow wire-to avoid it.

While demonstrating conclusively the existence of CQPS, the successful experiment also ushers in a novel class of devices that exploit the unique functionality of quantum phase-slip to forge a new path in superconducting electronics.

Related Links
RIKEN
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com




.
.
Get Our Free Newsletters Via Email
...
Buy Advertising Editorial Enquiries



And it's 3... 2... 1... blastoff! Discover the thrill of a real-life rocket launch.



.

. Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

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



CHIP TECH
Dutch high-tech group ASML reports Q1 profits slump
The Hague (AFP) April 18, 2012
The Dutch company ASML, a supplier of computer chip-making systems and a global high-tech bellwether, posted on Wednesday a 28 percent drop in first-quarter profit owing to weaker demand. Net profit stood at 282 million euros ($370 million), slightly better than an average analyst forecast of 279 million euros compiled by Dow Jones Newswires. Group sales dipped by 13.8 percent to 1.25 bi ... read more


CHIP TECH
Assembly begins for the third Ariane 5 to be launched in 2012

ILS Proton Successfully Launches Y1B Satellite For Yahsat

SpaceX aims for May 7 launch to ISS

SpaceX delays first private launch to space station

CHIP TECH
Mars Astronauts Could Risk DNA Damage

Asteroid sites hint at life on Mars

WSU astrobiologist proposes fleet of probes to seek life on Mars

People to Land on Mars in Next 40 Years

CHIP TECH
Winners of 19th Annual NASA Great Moonbuggy Race Announced

Russian Space Agency eyes Moon explorations

Russia postpones Luna-Glob moon mission

Russia Plans to Launch Lunar Rovers to Moon after 2020

CHIP TECH
Uranus auroras glimpsed from Earth

Herschel images extrasolar analogue of the Kuiper Belt

New Horizons on Approach: 22 AU Down, Just 10 to Go

CHIP TECH
Some Stars Capture Rogue Planets

ALMA Reveals Workings of Nearby Planetary System

UF-led team uses new observatory to characterize low-mass planets orbiting nearby star

When Stellar Metallicity Sparks Planet Formation

CHIP TECH
Crash of hypersonic test craft analyzed

The 'Missile Woman' behind Indian test launch

Peaceful atom for distant space missions

Why do N. Korea's missile tests keep failing?

CHIP TECH
China's Lunar Docking

Shenzhou-9 may take female astronaut to space

China to launch 100 satellites during 2011-15

Three for Tiangong

CHIP TECH
Dawn Gets Extra Time to Explore Vesta

NASA Mission Wants Amateur Astronomers to Target Asteroids

Space mining startup set for launch in US

NASA's Swift Monitors Departing Comet Garradd


Memory Foam Mattress Review

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: 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 1995-2012 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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. 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