Feeds

MIT wants quasars to help put free will to rest

Ringing the Bell on inequality

Secure remote control for conventional and virtual desktops

The last of three loopholes held to remain in Bell's Theorem, “setting independence”, is under the spotlight with an MIT research group saying that quasars could be used as random number generators and help prove* the validity of quantum mechanics.

(*The Register is well aware that quantum mechanics has withstood the most rigorous tests science has been able to throw at it: there remains, however, a theoretical question that's been elusive.)

Bell's work presents one of the longest-standing tests for the validity of quantum mechanics. In a classical universe, he explained, there is a limit to the correlation between entangled particles; hence, if scientists can demonstrate non-locality, their experiments support quantum mechanics.

Enter “setting independence”, also given the shorthand “free will”: the idea that someone attempting an experiment testing quantum mechanics is unable to act completely independently of the system they're trying to measure.

To put this in the form of a question: in measuring polarisation as the basis for testing the entanglement of two photons, how can the researcher guarantee that the system they're trying to test isn't somehow influencing the instrument settings they're using for the test?

And as MIT explains here, that could create an experimental bias in favour of quantum physics.

MIT Department of Physics professor David Kaiser, postdoc Andrew Friedman, and Jason Gallicchio from the University of Chicago, believe they've come up with a scheme that would guarantee the independence of their settings: base the experiment on quasars that are so far apart, they cannot possibly have any “causal contact” in the last 14 billion years.

This means that a random characteristic of each quasar can be proven to be completely independent.

For example: having generated a pair of entangled particles, the researcher needs to work out what characteristic is to be tested for each of them. Instead of (say) tossing a coin to make the decision for each particle, a telescopic observation of a very distant quasar would be used instead.

“In other words, quasar A determines the settings to detect particle A, and quasar B sets the detector for particle B,” MIT states. “If, after multiple measurements with this experimental setup, scientists found that the measurements of the particles were correlated more than predicted by the laws of classical physics, Kaiser says, then the universe as we see it must be based instead on quantum mechanics.”

The researchers believe that experiments could be designed using today's technology – which means that the last “nonlocality” loophole may be on the way to getting a test. ®

Secure remote control for conventional and virtual desktops

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
FORGET the CLIMATE: FATTIES are a MUCH BIGGER problem - study
Fat guy? Drink or smoke? You're worse than a TERRORIST
SEX BEAST SEALS may be egging each other on to ATTACK PENGUINS
Boffin: 'I think the behaviour is increasing in frequency'
HUMAN DNA 'will be FOUND ON MOON' – rockin' boffin Brian Cox
Crowdfund plan to stimulate Blighty's space programme
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 and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
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.
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.
Business security measures using SSL
Examines the major types of threats to information security that businesses face today and the techniques for mitigating those threats.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.