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Primeur weekly 2015-04-20

Special

Silvana Muscella to look back with satisfaction on a content-rich CloudScape VII event ...

Open standard Intercloud run by industry with global international standard on top of it would be ideal scenario ...

Rüdiger Dorn to present Microsoft's Trusted Cloud Initiative at CloudScape VII ...

The Cloud

ISC Cloud & Big Data keynote will recount bank's path into Cloud computing ...

Say it loud - it's fog and it's Cloud ...

IBM and partners to transform personal health with Watson and Open Cloud ...

Ministry of Health Brazil deploys Oracle Healthcare Master Person Index to improve health data interoperability ...

Desktop Grids

Alantu seeks beta testers ...

DENIS@Home to join BOINC ...

EuroFlash

RSC Group has deployed a massively parallel MVS-10P MP supercomputer based on RSC PetaStream architecture and the highest-performing Intel Xeon Phi 7120D at JSCC RAS ...

CoolIT Systems selected to host Birds-of-a-Feather (BoF) session at ISC 2015 in Frankfurt ...

PRACE Preparatory Access completes 20th cut-off with strong participation of industry ...

We-NMR cluster at Utrecht Bijvoet Center accommodated into Life Science Grid ...

CHAIN-REDS paves way for global e-Infrastructure ecosystem for researchers ...

USFlash

Intel Enterprise Edition for Lustre 2.2 launched ...

Storage boost at the National Computational Infrastructure in Australia ...

CASC announces new Director ...

OLCF selects application readiness projects to prepare for next-generation Summit supercomputer ...

Researchers to Tap NVLink to Power Next-Gen Research on Summit Supercomputer - ...

Computer-designed Rocker protein world's first to biomimic ion transport ...

For Big Data researchers, network and compute capabilities are lynchpin to success ...

Ultra-high-speed broadband bolsters UConn research ...

NIST tightens the bounds on the quantum information 'speed limit' ...

Electrical control of quantum bits in silicon paves the way to large quantum computers ...

Quantum cryptography at the speed of light: Researchers design first all-photonic repeaters ...

Electrical control of quantum bits in silicon paves the way to large quantum computers


Dr. Arne Laucht
10 Apr 2015 Sydney - A University of New South Wales (UNSW)-led research team has encoded quantum information in silicon using simple electrical pulses for the first time, bringing the construction of affordable large-scale quantum computers one step closer to reality.

Lead researcher, UNSW Associate Professor Andrea Morello from the School of Electrical Engineering and Telecommunications, said his team had successfully realised a new control method for future quantum computers. The findings were published in the open-access journalScience Advances.

Unlike conventional computers that store data on transistors and hard drives, quantum computers encode data in the quantum states of microscopic objects called qubits.

The UNSW team, which is affiliated with the ARC Centre of Excellence for Quantum Computation & Communication Technology, was first in the world to demonstrate single-atom spin qubits in silicon, reported inNaturein 2012 and 2013.

The team has already improved the control of these qubits to an accuracy of above 99% and established the world record for how long quantum information can be stored in the solid state, as published inNature Nanotechnologyin 2014.

It has now demonstrated a key step that had remained elusive since 1998.

"We demonstrated that a highly coherent qubit, like the spin of a single phosphorus atom in isotopically enriched silicon, can be controlled using electric fields, instead of using pulses of oscillating magnetic fields", explained UNSW's Dr. Arne Laucht, post-doctoral researcher and lead author of the study.

Associate Professor Morello said the method works by distorting the shape of the electron cloud attached to the atom, using a very localized electric field.

"This distortion at the atomic level has the effect of modifying the frequency at which the electron responds. Therefore, we can selectively choose which qubit to operate. It's a bit like selecting which radio station we tune to, by turning a simple knob. Here, the 'knob' is the voltage applied to a small electrode placed above the atom."

The findings suggest that it would be possible to locally control individual qubits with electric fields in a large-scale quantum computer using only inexpensive voltage generators, rather than the expensive high-frequency microwave sources.

Moreover, this specific type of quantum bit can be manufactured using a similar technology to that employed for the production of everyday computers, drastically reducing the time and cost of development.

The device used in this experiment was fabricated at the NSW node of the Australian National Fabrication Facility, in collaboration with the group led by UNSW Scientia Professor Andrew Dzurak.

Key to the success of this electrical control method is the placement of the qubits inside a thin layer of specially purified silicon, containing only the silicon-28 isotope.

"This isotope is perfectly non-magnetic and, unlike those in naturally occurring silicon, does not disturb the quantum bit", Associate Professor Morello stated.

The purified silicon was provided through collaboration with Professor Kohei Itoh from Keio University in Japan.
Source: University of New South Wales

Back to Table of contents

Primeur weekly 2015-04-20

Special

Silvana Muscella to look back with satisfaction on a content-rich CloudScape VII event ...

Open standard Intercloud run by industry with global international standard on top of it would be ideal scenario ...

Rüdiger Dorn to present Microsoft's Trusted Cloud Initiative at CloudScape VII ...

The Cloud

ISC Cloud & Big Data keynote will recount bank's path into Cloud computing ...

Say it loud - it's fog and it's Cloud ...

IBM and partners to transform personal health with Watson and Open Cloud ...

Ministry of Health Brazil deploys Oracle Healthcare Master Person Index to improve health data interoperability ...

Desktop Grids

Alantu seeks beta testers ...

DENIS@Home to join BOINC ...

EuroFlash

RSC Group has deployed a massively parallel MVS-10P MP supercomputer based on RSC PetaStream architecture and the highest-performing Intel Xeon Phi 7120D at JSCC RAS ...

CoolIT Systems selected to host Birds-of-a-Feather (BoF) session at ISC 2015 in Frankfurt ...

PRACE Preparatory Access completes 20th cut-off with strong participation of industry ...

We-NMR cluster at Utrecht Bijvoet Center accommodated into Life Science Grid ...

CHAIN-REDS paves way for global e-Infrastructure ecosystem for researchers ...

USFlash

Intel Enterprise Edition for Lustre 2.2 launched ...

Storage boost at the National Computational Infrastructure in Australia ...

CASC announces new Director ...

OLCF selects application readiness projects to prepare for next-generation Summit supercomputer ...

Researchers to Tap NVLink to Power Next-Gen Research on Summit Supercomputer - ...

Computer-designed Rocker protein world's first to biomimic ion transport ...

For Big Data researchers, network and compute capabilities are lynchpin to success ...

Ultra-high-speed broadband bolsters UConn research ...

NIST tightens the bounds on the quantum information 'speed limit' ...

Electrical control of quantum bits in silicon paves the way to large quantum computers ...

Quantum cryptography at the speed of light: Researchers design first all-photonic repeaters ...