Rydberg excitation of a Bose-Einstein condensate

arxiv.org ^ | March 2012 | M. Viteau1, M. Bason1, J. Radogostowicz2;3, N. Malossi1;2, O. Morsch1, D. Ciampini1;2;3, and E. Arim

[Kevmo]

Rydberg excitation of a Bose-Einstein condensate

http://arxiv.org/pdf/1203.1261v1.pdf

We have performed two-photon excitation via the 62P3=2 state to n=50-80 S or D Rydberg state
in Bose-Einstein condensates of rubidium atoms. The Rydberg excitation was performed in a quartz
cell, where electric fields generated by plates external to the cell created electric charges on the cell
walls. Avoiding accumulation of the charges and realizing good control over the applied electric field
was obtained when the fields were applied only for a short time, typically a few microseconds.
Rydberg excitations of the Bose-Einstein condensates loaded into quasi one-dimensional traps and
in optical lattices have been investigated. The results for condensates expanded to different sizes
in the one-dimensional trap agree well with the intuitive picture of a chain of Rydberg excitations
controlled by the dipole-dipole interaction. The optical lattice applied along the one-dimensional
geometry produces localized, collective Rydberg excitations controlled by the nearest-neighbour
blockade.
PACS numbers: 03.65.Xp, 03.75.Lm


…………………



V. CONCLUSIONS
We have demonstrated the controlled preparation
of Rydberg excitations in large ensembles of ultracold
atoms forming structures of localized collective excita-
tions, either self-generated by the long-range interactions
between Rydberg atoms or imposed by an optical lattice.
Our results can straightforwardly be extended to two-
and three-dimensional lattice geometries and to even
larger lattice spacings that will allow selective Rydberg
excitation on a single site. Furthermore, appropriate
detection techniques such as microchannel plates should
allow direct observation of the distribution of Rydberg
excitations in the lattice.
Classical and quantum correlations, and highly en-
tangled collective states are expected to be created, as
pointed out in [42] for one dimensional Rydberg gases
and in [43] for one-dimensional optical lattices. Our
results pave the way towards their controlled creation.

[Kevmo]

The Cold Fusion/LENR Ping List

http://www.freerepublic.com/tag/coldfusion/index?tab=articles

---

http://lenr-canr.org/

[Kevmo]

Interesting discussion on Vortex regarding this

http://www.mail-archive.com/vortex-l@eskimo.com/msg81294.html


On Mon, May 27, 2013 at 10:03 AM, Edmund Storms wrote:
> That is the idea. However, why would only a few hydrons fuse leaving just
> enough unreacted hydrons available to carry all the energy without it
> producing energetic radiation? I would expect occasionally, many hydrons
> would fuse leaving too few unreacted hydrons so that the dissipated energy
> would have to be very energetic and easily detected
>
***That would account for the very occasional neutron being observed,
right? And it also would account for how few of them get observed as
well. They only happen when a multiple-fusion event takes place inside the
BEC and there isn't enough BEC infrastructure to absorb the energy.



> . Also, how is this mass-energy coupled to the unreacted hydrons? The BEC
> is not stable at high temperatures, which would be present inside the BEC
> when mass-energy was released. I would expect this release would destroy
> the BEC, leaving the fused hydrons to dissipate energy by the normal hot
> fusion method.
>
***I would expect it as well. Like an explosion taking place inside a
house, the structure blocks much of the energy while it is momentarily in
place. And then another BEC forms, 2 atoms fuse, and the reaction goes on
& on.




> The concept appears to have many logical flaws.
>
> Ed Storms
>
> On May 27, 2013, at 10:08 AM, Kevin O'Malley wrote:
>
> Then is that an explanation of why Gamma rays are not observed in LENR?
> If 2 of the atoms inside a multi-atom BEC fuse together, the incoming
> radiation (to the rest of the BEC) gets subdivided based upon how many
> atoms have formed the BEC. Right?
>
>
> On Mon, May 27, 2013 at 12:49 AM, Axil Axil wrote:
>
>> This paper verifies that a photon eradiated Bose-Einstein condensate
>> will cut the frequency of incoming photons by dividing that frequency
>> between N numbers of atoms.
>>
>>
>> http://arxiv.org/pdf/1203.1261v1.pdf
>>
>>
>> Rydberg excitation of a Bose-Einstein condensate
>>
>>
>> “The results of theoretical simulations are represented by the
>> continuous lines.
>>
>>
>> According to the super-atom picture the collective Rabi frequency for the
>> coherent excitation of N atoms is
>>
>>
>> frequency (collective) = square root(number of atoms) X
>> frequency(single);
>>
>>
>> Where the single-particle Rabi frequency (single) is app 2 pi x 200 kHz
>> for our experimental parameters.”
>>
>
>

[Migraine]

hope levity is not too out of place — but the Beach Boys already accomplished this:

“I’m picking up good vibrations;
She’s giving me excitations...”

Hope this helps.

Otherwise, I just read some things that are distinctly over my head. :)

[Kevmo]

seems rather apt

[painter]

OK?

[freedumb2003]

>>Otherwise, I just read some things that are distinctly over my head<<

Lou Rawls: Animal, you know, you play the drums so good. I mean you take the sticks and you really lay down some great percussion!

Animal: Percussion! Wha!?

Floyd: Uh, Lou, you sort of have to consider Animal as your basic primitive man. You have to know how to talk to him.

Lou Rawls: Oh, yeah? Well, how do you tell a guy like that that his work with the sticks is *down*? He can really put some soul in the bowl, you know what I’m saying?

Floyd: Oh, yeah, well, that’s easy — Animal! Good drummer!

Animal: Good drummer, good drummer, good drummer.

[chaosagent]

What does Dr. Sheldon Cooper think about this?

[bigheadfred]

it is about the development of quantum computers among other things

[Argus]

You don’t say...

[bigheadfred]

Tailored Quantum States

[bigheadfred]

sunkenciv

[bigheadfred]

ping

nothing like doing it backwards

[BwanaNdege]

What does Penny think about this?

[Kevmo]

that’s kinda funny

[bigheadfred]

Yeah I looked at that and thought WTH? And then all I could do was laugh.

[Pontiac]

The results for condensates expanded to different sizes in the one-dimensional trap agree well with the intuitive picture of a chain of Rydberg excitations controlled by the dipole-dipole interaction.

OK what is a one dimensional trap and how can you trap anything in a one dimensional trap?

It seems to me any trap would require at least two dimensions.

[Kevmo]

I dunno.

Perhaps it means it’s being trapped into one place where it can’t move in any direction, making it a one-dimensional dot. If you had a 2-dimensional trap it would be able to move only back & forth along a line. A 3D trap would be a plane,and so on.

[jonrick46]

Could someone give a summary of what this experiment was and its conclusion in a way that ordinary people could understand?

[Kevmo]

Basically a Bose-Einstein Condensate (BEC) is a unique state of matter similar to how flame/plasma is also a unique state of matter. When atoms form a BEC, they have special properties. The BEC starts to act like a single atom, that kind of thing. One thing that happens with BECs is that atoms within them start to lose their energy. Perhaps even so much so that they’re allowed to get close enough together to fuse. That’s Dr. Y E Kim’s BEC theory for cold fusion.

His theory was criticized because BECs were thought to be incapable of forming at high temperatures, it was thought they’d only form near absolute zero. But recently BECs were generated at Room Temperature and even pretty hot temperatures, giving a leg up to Dr. Kim’s theory.

One of the problems with LENR is that under fusion conditions, it is known that very high energy is released in the form of gamma rays/neutrons, the kind of stuff that is so energetic it kills you. But neutrons have been observed at only very, very low levels. This paper demonstrates that BECs absorb high energy, in this case X-rays. So it is not a stretch to believe that LENR BECs absorb those nasty gamma rays.