Feeds

Boffins spin a solid state qubit in a nucleus

Reliable quantum memory in silicon

Top 5 reasons to deploy VMware with Tegile

A group of researchers from the University of New South Wales has produced a functioning solid-state qubit with a read-out fidelity of 99.8 percent, taking the world another step along the path towards a functioning quantum computer.

The team used the magnetic spin of the phosphorus nucleus as the basis for their experiment, published in Nature on April 18 (US time). They claim that accuracy rivals the 2012 Nobel-awarded “ion trap” – a single atom trapped in a vacuum chamber.

According to Associate Professor Andrea Morello from the School of Electrical Engineering and Telecommunications at UNSW, the team used magnetic resonance – as used in MRI scans – to “control and read-out the nuclear spin of a single atom in real time.”

The weak magnetic field of a phosphorus atom, they explain, exists either as “up” or “down”, or, in the quantum world, as a superposition of both. This experiment was about storage, rather than superposition: the information was stored by controlling the up-down direction of the nucleus' magnetic spin.

The big advance, the team claims, is that this experiment doesn't need the vacuum chamber of the ion trap. Instead, Morello explains, the phosphorus atom is “in a silicon chip that can be wired up and operated electrically like normal integrated circuits.”

In a previous experiment, the group had manipulated a whole atom; this time, they're working with the nucleus only. While the nucleus is harder to work with – it only occupies a millionth of the atom's diameter – it's also nearly immune from disturbances from the outside world.

“Our nuclear spin qubit can store information for longer times and with greater accuracy. This will greatly enhance our ability to carry out complex quantum calculations once we put many of these qubits together”, explained UNSW PhD student Jarryd Pla, lead experimental author of the paper. ®

Beginner's guide to SSL certificates

More from The Register

next story
Renewable energy 'simply WON'T WORK': Top Google engineers
Windmills, solar, tidal - all a 'false hope', say Stanford PhDs
SEX BEAST SEALS may be egging each other on to ATTACK PENGUINS
Boffin: 'I think the behaviour is increasing in frequency'
The next big thing in medical science: POO TRANSPLANTS
Your brother's gonna die, kid, unless we can give him your, well ...
Post-pub nosh neckfiller: The MIGHTY Scotch egg
Off to the boozer? This delicacy might help mitigate the effects
I'M SO SORRY, sobs Rosetta Brit boffin in 'sexist' sexy shirt storm
'He is just being himself' says proud mum of larger-than-life physicist
NASA launches new climate model at SC14
75 days of supercomputing later ...
Britain's HUMAN DNA-strewing Moon mission rakes in £200k
3 days, and Kickstarter moves lander 37% nearer takeoff
prev story

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
5 critical considerations for enterprise cloud backup
Key considerations when evaluating cloud backup solutions to ensure adequate protection security and availability of enterprise data.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Simplify SSL certificate management across the enterprise
Simple steps to take control of SSL across the enterprise, and recommendations for a management platform for full visibility and single-point of control for these Certificates.