Viewing profile — gji

These clocks depend dilute gasses of atoms. Usually the process for preparing and probing the atoms takes at least a few hundred milliseconds, and usually in the seconds range. The…

Just judging by the torque specs and comparing to a nema23 stepper, seems like it needs an order of magnitude more torque to compare. Note that in the comparison chart they compare…

Well it depends on what your bar is for a monopoly. E.g. I can only use Comcast where I live. Comcast is not technically a monopoly - I could move somewhere else where other provid…

You seem to be very convinced of this. At my institution, research activities has resumed for the past month (albeit with restrictions on occupancy).

Definitely not a cubic function though, you can't get a polynomial to hit 0 that nicely. Any polynomial's leading order term will dominate as x increases. Unless they're using a su…

I'm a physics grad student finishing up a PhD, would you have some time/be willing to chat about industry jobs? Email is in bio.

Practical from a cultural standpoint or in terms of quantity? IIRC, people are required to wear masks when entering businesses in China now.

Those benefits only apply to people who work at companies that have less than 500 employees. Unfortunately, that leaves most people in the lurch. https://www.nytimes.com/2020/03/14…

I've been using this cable: https://www.amazon.com/dp/B074W1G389/ref=cm_sw_r_cp_awdb_t1_... Haven't used it for 100W charging so I don't know if it stands up to the full rated 5A t…

Interestingly, the 100m record difference is about 10%, which is roughly the same as the gap in the ultramarathon records (and in the record mile time). So the difference is fairly…

I'm pretty sure the way analog degrees are freedom are mapped onto symbols is very important. In principle, if you have infinite SNR over a limited bandwidth, you can have infinite…

Source for this? I personally need 9+ hours as well but am constantly told I sleep for too long.

If you’re talking about the i9-9900, it’s a very high clock frequency part with “only” 8 cores and part of the consumer line (no ecc support). I’d actually think most people who ha…

Nature letter here: https://www.nature.com/articles/s41586-018-0707-9 Looks like they developed advancements with lightweight high-voltage converters and performance of the thruste…

I used to work on trapped ion experiments, and the limitation of the atom size was always the diffraction limit, which is limited by the NA of the lens (f-stop in camera terms) and…

Your first statement isn't quite true. See, for example, https://www.scottaaronson.com/blog/?p=473 In short, it's hard to classically model pretty simple quantum mechanical systems…

Those numbers aren't that bad, actually. A cell phone's peak power draw isn't much more than 5W, so you'd need 10g / efficiency. At 10% efficiency, that's 100g, which is 5 cm^3 for…

Cambridge (MA) is like this, but housing prices are still pretty unreasonable. You definitely need taller buildings.

Indeed, that's accurate (apart from finite temperature and interaction effects). A BEC is in some ways pretty similar to a laser, where all the photons are in the same state, even …

The electric field gets quickly attenuated in saltwater though, especially at high frequency: https://en.wikipedia.org/wiki/Communication_with_submarines

Nice game, but there's nothing intrinsically quantum about anything that happens. Everything is perfectly describable with classical E&M.

Andrea Morello's devices are essentially quantum dots - isolated electrons that behave like they are bound to a single atom. Unfortunately, almost all quantum dots require dilution…

The real evidence of this is from the last experiment under "Sequential Experiments". Essentially, you only select particles with spin-up in the z direction, then you select partic…

I also had a very different experience, was part of various "gifted" programs from 4th grade until I graduated high school. Many of my classmates are doing extremely well (grad sch…

Regarding your first point: from my experience (working on physics experiments that depend on vacuum I doubt UHV experience is relevant here though - at 100 torr you can probably g…