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Primeur weekly 2013-06-24

Special

Human Brain Project to seek support in neuromorphic computing and non-volatile memory approach ...

Deploying new and more energy-efficient combustion technologies with exascale power ...

Parallelism, hybrid architectures, fault tolerance and power major challenges for extreme computing ...

The Cloud

Dell launches secure and flexible Cloud solution for U.S. Governments ...

Eurotech launches new release of Everyware Cloud to simplify device management in the Internet of Things ...

Thermax Ltd chooses IBM PureSystems and SmartCloud over Cisco and Dell ...

Cloud computing user privacy in serious need of reform, scholars say ...

VTI brings Internet of Things (IOT) and Cloud computing to test and measurement ...

Desktop Grids

Seeking testers for BOINC on Android ...

SETIspirit Windows GUI for SETI@home released ...

Using IBM's crowdsourced supercomputer, Harvard rates solar energy potential of 2.3 million new compounds ...

EuroFlash

projectiondesign ships ProNet.precision, camera-assisted warp and blend software ...

Remote Cluster Administration offers a unique solution to the HPC skills gap ...

New Cluster Installation Further Strengthens Regional HPC Infrastructure ...

Altair Engineering announces 8th UK Altair Technology Conference;to be held at the Heritage Motor Centre, Gaydon, Warwickshire ...

GENOA, MCQ-Composites to join Altair Partner Alliance Composites line-up ...

Altair broadens relationship with Siemens PLM Software to enhance data exchange for its CAE software users ...

Neuroscience to benefit from hybrid supercomputer memory ...

ISC'13 caps 28th Conference with new attendance, awards and more ...

USFlash

CANARIE upgrades 100G research & education network with Ciena ...

Linguists, computer scientists use supercomputers to improve natural language processing ...

UC San Diego launches new research computing programme ...

Which qubit my dear? New method to distinguish between neighbouring quantum bits ...

Making memories: Practical quantum computing moves closer to reality ...

Intel introducing new Lustre solution during Lustre event, addressing new Lustre markets ...

NetApp unveils clustered data ONTAP innovations that pave the way for software-defined storage ...

HP expands Converged Storage portfolio ...

UC San Diego researchers get access to Open Science Grid ...

HP extends support for OpenVMS through year 2020 ...

IBM expands support for Linux on Power Systems servers ...

Which qubit my dear? New method to distinguish between neighbouring quantum bits


UNSW
18 Jun 2013 Sydney - Researchers at the University of New South Wales (UNSW) have proposed a new way to distinguish between quantum bits that are placed only a few nanometres apart in a silicon chip, taking them a step closer to the construction of a large-scale quantum computer. Quantum bits, or qubits, are the basic building blocks of quantum computers - ultra-powerful devices that will offer enormous advantages for solving complex problems.

Professor Michelle Simmons, leader of the research team, said a qubit based on the spin of an individual electron bound to a phosphorus atom within a silicon chip is one of the most promising systems for building a practical quantum computer, due to silicon's widespread use in the micro-electronics industry.

"However, to be able to couple electron-spins on single atom qubits, the qubits need to be placed with atomic precision, within just a few tens of nanometres of each other", she stated. "This poses a technical problem in how to make them, and an operational problem in how to control them independently when they are so close together."

The UNSW team, in collaboration with theorists at Sandia National Laboratories in New Mexico, has found a solution to both these problems. Their study is published in the journalNature Communications.

In a significant feat of atomic engineering, they were able to read-out the spins of individual electrons on a cluster of phosphorus atoms that had been placed precisely in silicon. They also propose a new method for distinguishing between neighbouring qubits that are only a few nanometres apart.

"It is a daunting challenge to rotate the spin of each qubit individually", stated Holger Büch, lead author of the new study. "If each electron spin-qubit is hosted by a single phosphorus atom, every time you try to rotate one qubit, all the neighbouring qubits will rotate at the same time - and quantum computation will not work."

"But if each electron is hosted by a different number of phosphorus atoms, then the qubits will respond to different electromagnetic fields - and each qubit can be distinguished from the others around it", he stated.

The UNSW team is part of the Australian Centre of Excellence for Quantum Computation and Communication Technology, a world-leading research centre headquartered in Sydney, Australia.

"This is an elegant and satisfying piece of work", stated Professor Simmons, centre director and Mr Büch's PhD supervisor. "This first demonstration that we can maintain long spin lifetimes of electrons on multi-donor systems is very powerful. It offers a new method for addressing individual qubits, putting us one step closer to realising a practical, large-scale quantum computer."

To make the tiny device, the researchers deposited a layer of hydrogen on a silicon wafer and used a scanning tunnelling microscope to create a pattern on the surface in an ultra-high vacuum.

This was then exposed to phosphine gas and annealed at 350 degrees so phosphorus atoms became incorporated precisely into the silicon. The device was then buried in another layer of silicon.

In a quantum computer information is stored in the spin, or magnetic orientation, of an electron. This spin can not only be in two states - up and down - just as in a classical computer.

It can also be in a combination of both states at the same time, allowing exponentially larger amounts of information to be stored and processed in parallel.

Source: University of New South Wales

Back to Table of contents

Primeur weekly 2013-06-24

Special

Human Brain Project to seek support in neuromorphic computing and non-volatile memory approach ...

Deploying new and more energy-efficient combustion technologies with exascale power ...

Parallelism, hybrid architectures, fault tolerance and power major challenges for extreme computing ...

The Cloud

Dell launches secure and flexible Cloud solution for U.S. Governments ...

Eurotech launches new release of Everyware Cloud to simplify device management in the Internet of Things ...

Thermax Ltd chooses IBM PureSystems and SmartCloud over Cisco and Dell ...

Cloud computing user privacy in serious need of reform, scholars say ...

VTI brings Internet of Things (IOT) and Cloud computing to test and measurement ...

Desktop Grids

Seeking testers for BOINC on Android ...

SETIspirit Windows GUI for SETI@home released ...

Using IBM's crowdsourced supercomputer, Harvard rates solar energy potential of 2.3 million new compounds ...

EuroFlash

projectiondesign ships ProNet.precision, camera-assisted warp and blend software ...

Remote Cluster Administration offers a unique solution to the HPC skills gap ...

New Cluster Installation Further Strengthens Regional HPC Infrastructure ...

Altair Engineering announces 8th UK Altair Technology Conference;to be held at the Heritage Motor Centre, Gaydon, Warwickshire ...

GENOA, MCQ-Composites to join Altair Partner Alliance Composites line-up ...

Altair broadens relationship with Siemens PLM Software to enhance data exchange for its CAE software users ...

Neuroscience to benefit from hybrid supercomputer memory ...

ISC'13 caps 28th Conference with new attendance, awards and more ...

USFlash

CANARIE upgrades 100G research & education network with Ciena ...

Linguists, computer scientists use supercomputers to improve natural language processing ...

UC San Diego launches new research computing programme ...

Which qubit my dear? New method to distinguish between neighbouring quantum bits ...

Making memories: Practical quantum computing moves closer to reality ...

Intel introducing new Lustre solution during Lustre event, addressing new Lustre markets ...

NetApp unveils clustered data ONTAP innovations that pave the way for software-defined storage ...

HP expands Converged Storage portfolio ...

UC San Diego researchers get access to Open Science Grid ...

HP extends support for OpenVMS through year 2020 ...

IBM expands support for Linux on Power Systems servers ...