There have been a bunch of stories recently talking about quantum effects at room temperature– one, about coherent transport in photosynthesis , even escaped the science blogosphere. They’ve mostly said similar things, but Thursday’s ArxivBlog entry had a particular description of a paper about entanglement effects that is worth unpacking: Entanglement is a strange and […]
Category: Atoms and Molecules
Amazing Laser Application 2: Laser Cooling!
What’s the application? Using lasers to reduce the speed of a sample of atoms, thereby reducing their temperature to a tiny fraction of a degree above absolute zero. What problem(s) is it the solution to? 1) “How can I make this sample of atoms move slowly enough to measure their properties very accurately?” 2) “How […]
Wolf Prize for Quantum Pioneers
Congratulations to Alain Aspect, John Clauser, and Anton Zeilinger for winning the 2010 Wolf Prize in Phyiscs: The 2010 Wolf Prize in Physics will be shared by Prof. John F. Clauser of the US; Prof. Alain Aspect of France’s Ãcole Normale Supérieure de Cachan; and Prof. Anton Zeilinger of the University of Vienna. The jury […]
Continuity, Discretion, and the Perils of Popularization
Last week’s Seven Essential Elements of Quantum Physics post sparked a fair bit of discussion, though most of it was at the expert level, well above the level of the intended audience. such is life in the physics blogosphere. I think it’s worth a little time to unpack some of the disagreement, though, as it […]
Single-Photon Cooling: Making Maxwell’s Demon
As mentioned previously, I’ve been reading Sean Carroll’s Wheel arrow of time book, which necessarily includes a good bit of discussion of “Maxwell’s Demon,” a thought experiment famously proposed by James Clerk Maxwell as something that would allow you to cool a gas without obviously increasing entropy. The “demon” mans a trapdoor between a sample […]
Trapping Ions With Light
There was a flurry of stories last week about an arxiv preprint on optical trapping of an ion. Somewhat surprisingly for an arxiv-only paper, it got a write-up in Physics World. While I generally like Physics World, I have to take issue with their description of why this is interesting: In the past, the trapping […]
Fifty Years of Solutions Finding Problems
2010 marks the 50th anniversary of the invention of the laser. To mark the occasion, the American Physical society has launched LaserFest, which will involve a large number of public events over the next year. The website includes a bunch of cool things explaining the physics of lasers, and a timeline of laser history with […]
How to Make Slow Atoms and Molecules 2
Consider the air around you, which is hopefully at something like “room temperature”– 290-300 K (60-80 F). That temeprature is a measure of the kinetic energy of the moving atoms and molecules making up the gas. At room temperature, the atoms and molecules in the air around you are moving at something close to the […]
How to Make Slow Atoms and Molecules 1
Consider the air around you, which is hopefully at something like “room temperature”– 290-300 K (60-80 F). That temeprature is a measure of the kinetic energy of the moving atoms and molecules making up the gas. At room temperature, the atoms and molecules in the air around you are moving at something close to the […]