Cambridge Scientists Create Huge Quantum Particles 52
judgecorp writes "Researchers at Cambridge University have produced a quantum fluid thousands of times larger than previously, leading to the possibility of polaritons produced at lower power and at a broader temperature range. This could lead to quantum circuits, as well as applications such as more sensitive gyroscopes."
The paper was published in Nature Physics on January 8th, but a pre-press version is available through arXiv.
Quantum Participles (Score:5, Funny)
Re:Quantum Participles (Score:5, Funny)
Yes, they travel faster than light, so depending on where you are they're past participles before you even see them!
Re: (Score:2)
Re: (Score:3)
It's a British thing. Queen's English. What what.
Re: (Score:3)
Well, they're making up words like polaritions, so linguistics it is! Bythe way, is a polarition a polariton that's just apparitional, or what?
Re: (Score:2)
Re: (Score:1)
Re: (Score:2)
So, when do the tachyons come into play again? There's always tachyons it seems.
Re: (Score:1)
On the other hand, I suppose if you wanted to increase the effectiveness of the gathering nets, you could coat them with a few tachyon bursts, which means they would collect polaritons from all the surrounding times at once. THEN the only problem is re-integrating all of the polaritons into the same time frame, a phase inverter synced with the rotatio
Re: (Score:2)
ultrasensitive gyroscopes to measure gravity, magnetic field
Without more information, it is impossible to determine if they will be pragmatically superior to the existing laser gyroscopes [wikipedia.org], or even the humble Fluxgate Compass. [wikipedia.org]
Re:Quantum Participles (Score:5, Funny)
They spelled it right, you just changed it by reading it.
Re:Quantum Participles (Score:5, Funny)
The joke was funny, you just changed it by telling it.
*jk
Re:Quantum Participles (Score:5, Funny)
I wonder if they dangle.
Re:Quantum Participles (Score:4, Funny)
Until observed, they are both dangling and not dangling.
Re: (Score:2)
Re: (Score:1)
Re: (Score:1)
That would be cunning.
But do these participles still exist...... (Score:4, Funny)
quantum verbs? (Score:3)
Stop adjectivizing quantum verbs, they don't like it.
Re: (Score:3)
You mean like this [youtube.com]? ;)
Re: (Score:2)
Size doesn't matter (Score:2)
and if it is dangling participle, it will be smaller
Carrying on a geeky tradition (Score:5, Funny)
Physicist A: "We need to make something cool out of them... like one of those tiny violins or the art on a microchip..."
Physicist B: "Let's make boobs! Every sculptor makes boobs eventually! Quantum boobs!"
Physicist A: "OK, but they gotta be HUGE! Then we can use normal particles for the nipples!"
I've been hanging around lonely geeks too long.
This has been needed for decades (Score:4, Funny)
Great! My lights have been needing a bottle of blinker fluid for the longest time!
Re:This article says nothing. (Score:5, Informative)
Does anybody here understand what these scientists have supposedly achieved?
This is in my area of research, and I read and understood the abstract. It does not seem like something that should be posted on Slashdot.
In this case, quantum fluid means a fluid that is cold enough, dense enough, and made of low enough mass particles that it has some quantum mechanical properties (interference is an example in the abstract).
Making a bigger quantum fluid is not really a challenge - you just need a bigger refrigerator and a bigger tank of helium. In this case, they made a bigger quantum fluid of a very specialized type.
But isn't the whole point to quantum science that observation collapses a state into one thing or the other?
No. That is just one small part of quantum mechanics.
Re: (Score:2)
I compliment you on your answer. Until I read your post, it appeared that they were working with some form of bolonium laced with unobtainium to make their claims.
Seeing your answer makes me thing some people might also find this helpful:
BEC - What is it and where did the idea come from? [colorado.edu]
or this..
Bose–Einstein condensation [pnas.org]
Re: (Score:2)
One simple obvious thing I haven't figured out, is if super-cooled Helium qualifies as a Bose-Einstein condensate, and if not why not? Everything I see on this refers to BEC's being created in 1995, but I equally see the properties of supercooled helium as being due to Bose-Einstein Statistics, even to a point of noting that Helium IV creates a superfluid faster than (at higher temperature) because Helium IV is naturally a boson, while Helium III is only a boson in pairs.
Do superfluids qualify as a condensa
Re:This article says nothing. (Score:5, Informative)
One simple obvious thing I haven't figured out, is if super-cooled Helium qualifies as a Bose-Einstein condensate, and if not why not? Everything I see on this refers to BEC's being created in 1995, but I equally see the properties of supercooled helium as being due to Bose-Einstein Statistics, even to a point of noting that Helium IV creates a superfluid faster than (at higher temperature) because Helium IV is naturally a boson, while Helium III is only a boson in pairs.
Do superfluids qualify as a condensate, could they qualify if they were cooled further, and what are the actual differences between a Helium IV superfluid and a condensate?
(Yes I work in BEC)
Helium 4 becomes superfluid at low temperatures because there is Bose-Einstein condensation present in the Helium, but it's only a small fraction of the total sample (at very low temperatures the condensate fraction is ~ 10%, while the superfluid fraction is in ~ 100%). The actual situation in this system is massively complicated by the fact that Helium is a liquid in this regime.
Einstein's prediction of condensation was for an ideal gas (i.e., no interactions between the atoms). The novelty here is that the transition to a different phase of matter is therefore driven by the quantum statistics, rather than interactions between the atoms (as in every other phase transition).
The next-most-simple scenario is a near-ideal gas, i.e., a bunch of atoms which scatter off one another (in one-on-one collisions only), and which don't scatter very hard. This system will also undergo condensation, though of course some pedants will argue that it isn't the Bose-Einstein transition anymore because interactions are present. It's very closely related though.
This near-ideal-gas system provided (in ~ 1950s ) a theoretical basis for qualitatively understanding superfluid Helium, despite the fact that it's a terrible approximation, as liquid Helium is just that: Liquid, and so the atoms are interacting with one another like crazy. The condensates realized in the late nineties are formed in gaseous samples, where the near-ideal-gas type of model can be quantitatively accurate, and virtually 100% pure condensates can be formed in this way. One upshot of this is that you can observe a lot of the phenomenology that is associated with all BEC in principle, but which in practice would be impossible to observe in a system like liquid Helium.
Re:This article says nothing. (Score:5, Informative)
The expression "quantum fluid" can be misleading.
What they did here is make a system of coherent "polaritons" just as laser light is a bunch of coherent photons/light waves. As mentioned in the article abstract, a polariton is some combination of a photon (light particle) and an exciton. In turn, an exciton is a bound state of an electron and a hole from the semiconductor. (A hole is the 'vacant' positive charge created when an electron is removed, and may for all practical purposes be regarded as an anti-electron within the semiconductor.) If I understand correctly, the novelty in this work is not making the polariton condensate but the visualization of it. In that sense, the summary if way off.
This is surely not easy to grasp for the layman. What does this imply? As parent mentioned, making coherent quantum states or matter is a standard affair by now, and research focuses on extending our capabilities on all levels. It is necessary for our understanding of the fundamentals of quantum mechanics and how many particles conspire to make laboratory but also everyday matter. The practical possibilities for making devices out of "quantum fluids" is severely limited, since you almost always need extremely low temperatures to produce them. Only superconductors come close.
Re: (Score:2)
This begs the question as to who generates more exitons: Sara Underwood or Candace Bailey?
Re: (Score:1)
And the beauty of this fluid is that if you spill it it ceases to exist!
No mess, no fuss and no cleaning up.
Re: (Score:1)
If i understand it correctly, they just made bosson condensate from from polariton quasiparticles.
Bosson condensate is nothing new. Bossons are integer spin particles which means they can occupy the same energy level or quantum state with other bossons of the same type (on other hand, fermions - particles with half integer spin - never occupy same quantum state with other fermions of the same type, that's why electrons are placed in energetic layers around atom nuclei).
Lot of bossons in basic energy state b
Recent condensation? (Score:2)
I don't understand what's new about polaritons in semiconductor nanostructures. You only need a multi quantum well structure and pump it at the right angle with a laser.
Larger than previously? Not. (Score:3)
I think the record still belongs to Bose condensates [wikipedia.org] that have been created in the lab, essentially amounting to huge single quantum "particles".
Next Step.. (Score:1)
Polaritons? Just makin' **** up, are we? (Score:2)
I know the menagerie of particles and things-we-like-to-model-as-if-they-were-particles becomes huge.
Even so, after starting my morning with an article about quantum "polaritons", I will have this [archive.org] running through my head all day...
Lyrics here [lyricsmania.com] if you don't want your friends to know you listen to goth trek filk.
Re: (Score:2)
These Particles are so big (Score:2)
they follow you home.
As long as they don't hog the sofa!
Or Not (Score:1)