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(MIT Technology Review)   Magnetic Waveguides and Quantum Computing: It's just a series of tubes, man   (technologyreview.com) divider line 20
    More: Cool, magnetic fields, quantum computing, tubes, quantum information processing, metamaterials, qubits, electromagnetic waves, Autonomous University of Barcelona  
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2273 clicks; posted to Geek » on 26 Apr 2013 at 2:24 PM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2013-04-26 02:36:33 PM  
Next up...farking tractor beams!

www.blastr.com
 
2013-04-26 02:38:18 PM  
I'm usually able to grok most of what's written in stories like this, but this one just gave me melty braining like such as and
 
2013-04-26 02:44:44 PM  
This could be particularly relevant in the context of nitrogen-vacancy color defect centers in a diamond nanocrystal

Totally came here to say exactly this.  Way to steal my thunder, Poindexter.
 
2013-04-26 02:58:27 PM  
Dr. Doom yelled at Magneto for this back in the 80's.  Almost cost Shadow Cat her life.
 
2013-04-26 03:12:17 PM  
Magnetic hose?  That's what your mom said last night.
 
2013-04-26 03:18:50 PM  

BKITU: I'm usually able to grok most of what's written in stories like this, but this one just gave me melty braining like such as and


So it's a big deal because of Maxwell's equations, and the a-symmetry between how those equations govern magnetic and electric fields. Electric fields have a non-zero divergence, so field lines may terminate at infinity. Magnetic fields have zero divergence (there are not magnetic monopoles, "magnetic charge") so field lines must terminate at their source.  (forming a closed loop)

I presume it is rather difficult to allow the filed lines to wrap back around and terminate on their source if you pass the filed lines through a wire ("hose") of any considerable length. Note that the length of the hose discussed in this article is 7cm.

That being said, the article does reference the ArXiv post, and the authors in said post have a solid presence on the ArXiv, which means that they are at least not bat-shiat-crazy-left-fielders. However I did not check their peer-reviewed presence, so they may be just bat-shiat-crazy.
 
2013-04-26 03:25:06 PM  

BKITU: I'm usually able to grok most of what's written in stories like this, but this one just gave me melty braining like such as and


awordforscience.files.wordpress.com
 
2013-04-26 03:42:46 PM  

QuantuMechanic: BKITU: I'm usually able to grok most of what's written in stories like this, but this one just gave me melty braining like such as and

So it's a big deal because of Maxwell's equations, and the a-symmetry between how those equations govern magnetic and electric fields. Electric fields have a non-zero divergence, so field lines may terminate at infinity. Magnetic fields have zero divergence (there are not magnetic monopoles, "magnetic charge") so field lines must terminate at their source.  (forming a closed loop)

I presume it is rather difficult to allow the filed lines to wrap back around and terminate on their source if you pass the filed lines through a wire ("hose") of any considerable length. Note that the length of the hose discussed in this article is 7cm.

That being said, the article does reference the ArXiv post, and the authors in said post have a solid presence on the ArXiv, which means that they are at least not bat-shiat-crazy-left-fielders. However I did not check their peer-reviewed presence, so they may be just bat-shiat-crazy.


The fields still wrap, it's just that their field strength at an arbitrary distance away from the source, far end of the waveguide, was found to be 90% of the field strength of the near end instead of whatever is should be (decreasing by square of distance plus permeability loss). Cool stuff.
 
2013-04-26 03:47:54 PM  
Ya, and it's not AC. supercool
 
2013-04-26 04:54:34 PM  

QuantuMechanic: (there are not magnetic monopoles, "magnetic charge"


Um, they also said man would never fly. Just keep looking, computers and technology will mean that in a few years, we'll be able to 3D print magnetic monopoles at home.
 
2013-04-26 06:12:08 PM  

Quantum Apostrophe: QuantuMechanic: (there are not magnetic monopoles, "magnetic charge"

Um, they also said man would never fly. Just keep looking, computers and technology will mean that in a few years, we'll be able to 3D print magnetic monopoles at home.


Probably. My great grandfather almost died of heart failure but we 3D printed a gun and shot him.
 
2013-04-26 06:42:01 PM  
By the way, not being serious. 3D printed guns don't come with bullets. That sure was awkward.
 
2013-04-26 06:58:27 PM  

Stone Meadow: Next up...farking tractor beams!

[www.blastr.com image 740x545]


lol, no

Navy produced a stable plasma discharge packet a month ago
We have blasters.
 
2013-04-26 07:44:22 PM  

prjindigo: Stone Meadow: Next up...farking tractor beams!

[www.blastr.com image 740x545]

lol, no

Navy produced a stable plasma discharge packet a month ago
We have blasters.


I'd like to see how, as plasma usually dissipates  a few centimeters from the emitter. Self contained magnetic bubble?
 
2013-04-26 08:15:18 PM  
FTA: They placed a coil at one of the tube that generated a magnetic field of 1.3 mTelsa.

Only 1.3 millitelsas? Niloka Telsa is unimpressed.
 
2013-04-26 09:08:38 PM  

Bisu: FTA: They placed a coil at one of the tube that generated a magnetic field of 1.3 mTelsa.

Only 1.3 millitelsas? Niloka Telsa is unimpressed.


I dunno. Maybe I don't know science, but a Tesla is the mass of a Tesla ejaculate, right? Depending on the rate of fire, he might be impressed.
 
2013-04-26 09:52:01 PM  

prjindigo: Stone Meadow: Next up...farking tractor beams!

[www.blastr.com image 740x545]

lol, no

Navy produced a stable plasma discharge packet a month ago
We have blasters.


Brah...you are totally harshing my buzz!
 
2013-04-26 10:02:36 PM  
Where is the guy who always posts in QC computing threads saying he worked in a QC lab, but doesn't know anything about QC?
 
2013-04-26 10:55:36 PM  

Quantum Apostrophe: QuantuMechanic: (there are not magnetic monopoles, "magnetic charge"

Um, they also said man would never fly. Just keep looking, computers and technology will mean that in a few years, we'll be able to 3D print magnetic monopoles at home.


How will that allow us to colonize other planets? That is, in the long term, a very pressing issue as we keep breeding ourselves to death.
 
2013-04-27 02:22:49 PM  

Smoking GNU: I'd like to see how, as plasma usually dissipates  a few centimeters from the emitter. Self contained magnetic bubble?


yeah, but it rides a laser beam that create a tube of superheated space for the plasma to keep going in.
 
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