Category: Physics

What Is Squeezing?

Because nothing makes a physics post like a dated pop-culture reference. From http://www.whipple.org/photos/charmin.html

In the Physics Blogging Request Thread the other day, I got a comment so good I could’ve planted it myself, from Rachel who asks: It’s a term I see used a lot but don’t really know what it means – what is a “squeezed state”? What does “squeezing” mean? (in a QM context of course…)… Continue reading What Is Squeezing?

Atom by Atom Interaction: “Direct Measurement of the van der Waals Interaction between Two Rydberg Atoms”

Figure 2 from the paper described in the text.

I’m always a little ambivalent about writing up papers that have also been written up in Physics: on the one hand, they make a free PDF of the paper available, which allows me to reproduce figures from the paper in my post, since I’m not breaking a paywall to do it. Which makes it much… Continue reading Atom by Atom Interaction: “Direct Measurement of the van der Waals Interaction between Two Rydberg Atoms”

More on “Death Rays”: Another Estimation Technique

One of the great things about “Fermi Problems” is that there are multiple ways of attacking them. So, for example, when considering the death ray plot yesterday, I used medical devices as an example system to assess the plausibility of the plot, while Physics Buzz talked total energy. But those aren’t the only ways to… Continue reading More on “Death Rays”: Another Estimation Technique

On “Death Rays”

One bad thing about SteelyKid’s preschool graduation yesterday was that it drained my phone battery, causing me to miss an interview request from a local TV station looking for somebody to talk about a a couple of local guys arrested for a plot to build a “death ray” from X-ray components. This is pretty far… Continue reading On “Death Rays”

“Singular Oddities of Character”: Cavendish and Dirac

The Honorable Henry Cavendish (left) and P. A. M. Dirac, finalists for the most awkward physicist of all time.

One of the oddities of writing the book-in-progress is that it involves a lot more history-of-science than I’m used to. which means I’m doing things like checking out 800-page scientific biographies from the college library so I can use them to inform 500 word sections of 4000 word chapters. One of these is Cavendish: The… Continue reading “Singular Oddities of Character”: Cavendish and Dirac

Quasi Poll: Most Needed Pop-Science Biography?

Wolfgang Pauli kicking a soccer ball into Roy Glauber's camera, from Glauber's Nobel bio.

I’ve got a ton of stuff that needs to get done this week, but I don’t want the blog to be completely devoid of new content, so here’s a quasi-poll question for my wise and worldly readers: What scientist is most in need of a good popular biography? By “popular biography,” I mean things like… Continue reading Quasi Poll: Most Needed Pop-Science Biography?

Of Controversies and Clocks

Schematic of an atom interferometer or clock comparison, from Hohensee et al., http://arxiv.org/abs/1102.4362

A few months back, I got a call from a writer at a physics magazine, asking for comments on a controversy within AMO physics. I read a bunch of papers, and really didn’t quite understand the problem; not so much the issue at stake, but why it was so heated. When I spoke to the… Continue reading Of Controversies and Clocks

Few-Body Systems: Cooler Than You Might Think

Figure 2 from the arxiv version of the preparation paper.

Hey, dude? Yeah, what’s up? I’m not normally the one who initiates this, but I was wondering: When you were at DAMOP last week, did you see any really neat physics? Oh, sure, tons of stuff. It was a little thinner than some past meetings– a lot of the Usual Suspects didn’t make the trip–… Continue reading Few-Body Systems: Cooler Than You Might Think