Feeds

Another step forward for diamond-based quantum computers

Square cut or pear-shaped, these qubits don't lose their shape

Internet Security Threat Report 2014

Building simple quantum gates is common, but creating something that could be built on transistor-like scale is a huge challenge. Now, boffins from the Technical University of Vienna, Japan's National Institute of Informatics, and NTT's Basic Research Labs are offering an architecture they reckon can be scaled up.

What the researchers are offering, they believe, is a basic architecture they think would support a scalable quantum computer based on spins of nitrogen atoms in diamonds.

The architecture uses nitrogen atoms that can occupy two spin states, injected into a diamond, with each nitrogen defect trapped in a two-mirror optical resonator. Optical fibres let the engineers couple photons to this quantum system, allowing them to work with it without destroying the nitrogen atom spins.

As the researchers write in their paper at Physical Review X, “Modules are connected by photons propagating in a fiber-optical network. The cavities mediate interactions between the photons and the electron spins, enabling entanglement distribution and readout. The electron spins are coupled to nuclear spins, which constitute long-lived quantum memories where quantum information is stored and processed”.

Individual systems can then be connected together in an error-resistant two-dimensional array, the researchers say. Around 4.5 billion individual qubits would be required to run Shor's prime-factoring quantum computing algorithm on a 2048-bit prime, they add, but this architecture offers the potential for its individual elements to be miniaturised.

A quantum-diamond experimental chip at TU Vienna

TU Vienna is already experimenting with nitrogen-in-diamond quantum chips. Image: TU Vienna

TU Vienna's announcement is here.

Last year, UC Santa Barbara researchers demonstrated controlling a nitrogen vacancy centre in diamond using photons. ®

Beginner's guide to SSL certificates

More from The Register

next story
MEN: For pity's sake SLEEP with LOTS of WOMEN - and avoid Prostate Cancer
And, um, don't sleep with other men. If that's what worries you
Voyager 1 now EIGHTEEN LIGHT HOURS from home
Almost 20 BEEELION kilometres from Sol
Jim Beam me up, Scotty! WHISKY from SPAAACE returns to Earth
They're insured for $1m, before you thirsty folks make plans
ROGUE SAIL BOAT blocks SPACE STATION PODULE blastoff
Er, we think our ISS launch beats your fishing expedition
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
BAE points electromagnetic projectile at US Army
Railguns for 'Future fighting vehicle'
OK Google, do I have CANCER?
Company talks up pill that would spot developing tumors
LONG ARM of the SAUR: Brachially gifted dino bone conundrum solved
Deinocheirus mirificus was a bit of a knuckle dragger
prev story

Whitepapers

Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
New hybrid storage solutions
Tackling data challenges through emerging hybrid storage solutions that enable optimum database performance whilst managing costs and increasingly large data stores.
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.