Purer-than-pure silicon solves problem for quantum tech

Astronomy, Chemistry, Earth Sciences, Mathematics & Physics.

Moderators: kiore, Blip, The_Metatron

Purer-than-pure silicon solves problem for quantum tech

#1  Postby DougC » Aug 12, 2014 8:55 pm

http://www.bbc.co.uk/news/science-environment-28632263
B.B.C. Article
In a quantum computer, pure silicon is not enough - only one specific type of silicon atom will do.
The good stuff is silicon-28, and physicists in the US have worked out how to produce it with 40 times greater purity than ever before.
Even better, they can do it in the lab instead of relying on samples made ten years ago in a huge, repurposed plutonium plant in St Petersburg.

Image

This promises to solve a serious supply problem in quantum computing research.
Several of the most promising schemes for building a quantum computer are based in silicon. One that has received much attention stores "qubits" in atoms of another element, like phosphorous, embedded in a tiny layer of ultra-pure silicon-28.
Qubits are the quantum replacement for bits - the ones and zeros that represent information inside a conventional computer. They promise to usher in a new era of computing because they can simultaneously encode a one and a zero, enabling incredibly fast and complex calculations.

(Continues)
To do, is to be (Socrate)
To be, is to do (Sartre)
Do be do be do (Sinatra)
SUBWAY(1985)
DougC
THREAD STARTER
 
Posts: 14615
Age: 50
Male

Country: UNITED Kingdom
United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#2  Postby scott1328 » Aug 13, 2014 3:10 am

I've heard there is an effort underway using this pure silicon to precisely determine Avogadro's constant and from this redefine the kilogram as being the mass of a specific number of silicon atoms.
User avatar
scott1328
 
Name: Some call me... Tim
Posts: 8849
Male

United States (us)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#3  Postby Sgt Kelly » Aug 13, 2014 9:48 am

Does that mean we have to go back to the moon and replace the gold disk ?
User avatar
Sgt Kelly
 
Posts: 460
Age: 49
Male

Belgium (be)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#4  Postby DavidMcC » Aug 13, 2014 2:32 pm

Sgt Kelly wrote:Does that mean we have to go back to the moon and replace the gold disk ?


BTW they aren't gold discs. If they were, they would probably have had to be replaced by now in any case, due to stress failure.
http://geophysics.ou.edu/solid_earth/readings/apollo_laser_ranging.html
The laser reflector consists of 100 fused silica half-cubes, called corner cubes, mounted in a 46-centimeter square aluminum panel. Each corner cube is 3.8 centimeters in diameter. Corner cubes reflect a beam of light directly back toward the point of origin.

EDIT: Also, the corners are an essential part of the reflector, because they ensuree that the reflected beam retraces the path of the incident beam, no matter what the angle of incidence.
May The Voice be with you!
DavidMcC
 
Name: David McCulloch
Posts: 14913
Age: 69
Male

Country: United Kigdom
United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#5  Postby DavidMcC » Aug 13, 2014 2:37 pm

... Perhaps more to the point, why would the silicon purity problem affect the reflector results?
May The Voice be with you!
DavidMcC
 
Name: David McCulloch
Posts: 14913
Age: 69
Male

Country: United Kigdom
United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#6  Postby Sgt Kelly » Aug 21, 2014 11:44 am

I'm talking out of my ass.

Firstly I was thinking of the golden records that were sent along with the Voyager spacecraft.

Secondly I was led to believe that some universal constants were mentioned on this record to indicate to any extraterrestrials that we are aware of them. This is apparently not the case.
User avatar
Sgt Kelly
 
Posts: 460
Age: 49
Male

Belgium (be)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#7  Postby campermon » Aug 21, 2014 11:48 am

Sgt Kelly wrote:I'm talking out of my ass.

Firstly I was thinking of the golden records that were sent along with the Voyager spacecraft.

Secondly I was led to believe that some universal constants were mentioned on this record to indicate to any extraterrestrials that we are aware of them. This is apparently not the case.


One of my favourite images from the golden discs:

Image

:lol:

http://en.wikipedia.org/wiki/Contents_o ... den_Record
Scarlett and Ironclad wrote:Campermon,...a middle aged, middle class, Guardian reading, dad of four, knackered hippy, woolly jumper wearing wino and science teacher.
User avatar
campermon
RS Donator
 
Posts: 17443
Age: 52
Male

United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#8  Postby Pulsar » Aug 21, 2014 11:57 am

campermon wrote:One of my favourite images from the golden discs:

No wonder aliens haven't made contact.
"The longer I live the more I see that I am never wrong about anything, and that all the pains that I have so humbly taken to verify my notions have only wasted my time." - George Bernard Shaw
User avatar
Pulsar
 
Posts: 4618
Age: 45
Male

Country: Belgium
Belgium (be)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#9  Postby Pulsar » Aug 21, 2014 12:08 pm

scott1328 wrote:I've heard there is an effort underway using this pure silicon to precisely determine Avogadro's constant and from this redefine the kilogram as being the mass of a specific number of silicon atoms.

Yep.

"The longer I live the more I see that I am never wrong about anything, and that all the pains that I have so humbly taken to verify my notions have only wasted my time." - George Bernard Shaw
User avatar
Pulsar
 
Posts: 4618
Age: 45
Male

Country: Belgium
Belgium (be)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#10  Postby newolder » Aug 21, 2014 12:17 pm

Marcus du Sautoy covered this in his Precision series on the beeb... Episode 2 at this link http://www.bbc.co.uk/programmes/b02xbjmf/episodes/guide but the content is behind a paywall. :sad:

Silicon isotopes distorted the first attempt, iirc.
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7876
Age: 1
Male

Country: Feudal Estate number 9
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#11  Postby DougC » Aug 21, 2014 12:38 pm

Saw that. Good show. :thumbup:
To do, is to be (Socrate)
To be, is to do (Sartre)
Do be do be do (Sinatra)
SUBWAY(1985)
DougC
THREAD STARTER
 
Posts: 14615
Age: 50
Male

Country: UNITED Kingdom
United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#12  Postby campermon » Aug 21, 2014 12:45 pm

newolder wrote:Marcus du Sautoy covered this in his Precision series on the beeb... Episode 2 at this link http://www.bbc.co.uk/programmes/b02xbjmf/episodes/guide but the content is behind a paywall. :sad:

Silicon isotopes distorted the first attempt, iirc.


[Reveal] Spoiler: "..."
http://www.novamov.com/video/tujdhob34h2jk


:whistle:
Scarlett and Ironclad wrote:Campermon,...a middle aged, middle class, Guardian reading, dad of four, knackered hippy, woolly jumper wearing wino and science teacher.
User avatar
campermon
RS Donator
 
Posts: 17443
Age: 52
Male

United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#13  Postby scott1328 » Aug 21, 2014 1:24 pm

Is there an element with only 1 stable isotope?
User avatar
scott1328
 
Name: Some call me... Tim
Posts: 8849
Male

United States (us)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#14  Postby campermon » Aug 21, 2014 1:33 pm

scott1328 wrote:Is there an element with only 1 stable isotope?


http://en.wikipedia.org/wiki/Monoisotopic_element

:thumbup:
Scarlett and Ironclad wrote:Campermon,...a middle aged, middle class, Guardian reading, dad of four, knackered hippy, woolly jumper wearing wino and science teacher.
User avatar
campermon
RS Donator
 
Posts: 17443
Age: 52
Male

United Kingdom (uk)
Print view this post

Re: Purer-than-pure silicon solves problem for quantum tech

#15  Postby scott1328 » Aug 21, 2014 3:27 pm

campermon wrote:
scott1328 wrote:Is there an element with only 1 stable isotope?


http://en.wikipedia.org/wiki/Monoisotopic_element

:thumbup:


I guess I asked a bad question. I meant: is there an element with only 1 stable isotope, whose radioactive isotopes have a short enough half-life to be more suitable than silicon for this kind of thing? Perhaps the other elements are too reactive? Perhaps Gold?
User avatar
scott1328
 
Name: Some call me... Tim
Posts: 8849
Male

United States (us)
Print view this post


Return to Physical Sciences & Mathematics

Who is online

Users viewing this topic: No registered users and 1 guest

cron