Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: CZARCAR on 05/10/2011 18:23:50

Title: ?laser cooling?
Post by: CZARCAR on 05/10/2011 18:23:50

http://www.physorg.com/news/2011-10-laser-cool-quantum-ground-state.html

Title: ?laser cooling?
Post by: yor_on on 05/10/2011 19:46:38

So, is there a threshold for stopping motion with motion?
That is, can you reach a place without motion?

Depends on how you view HUP, doesn't it?

Title: ?laser cooling?
Post by: imatfaal on 06/10/2011 09:58:15

Quote from: yor_on on 05/10/2011 19:46:38

So, is there a threshold for stopping motion with motion?
That is, can you reach a place without motion?

Depends on how you view HUP, doesn't it?

No you cannot reach a place without motion.  The paper's preprint here  (http://arxiv.org/pdf/1106.3614) clearly states the the laser cooling of this and other experiments reduces oscillations till only the qm ground state remains

Quote

Recently, in experiments performed at temperatures of a few hundredths of a Kelvin, engineered nanomechanical
resonators coupled to electrical circuits have been measured to be oscillating quietly in their quantum ground state

The important advance that this paper describes is that the team have managed to get the beam into ground state with a background temperature that is much higher than previously managed (~20 K) which might allow these devices to be used in a non-experimental/commercial setting