This is a rather common misconception about sensitivity, it is only true under the constraint where you are unable to increase the amplitude of your measurement.

You are always limited by shot noise (counting noise, quantisation noise, Poisson noise, whatever name you give it). And people love to say that you can only beat it by squeezing (increase noise in one quadrature to reduce it in another). But another option is to just increase N, turn up the laser power to have more photons or atoms in your sensor and watch your noise floor drop way faster than you will ever get using squeezing.

Now the cold atom sensors are an interesting case. No one has managed to laser cool atoms faster than an overall rate of around 10^9 atoms per second. And we have been stuck there since the mid 2000s. As a result, the fundamental noise limit from shot noise hampers these cold atom accelerometers significantly in short term sensitivity, as they just don’t have enough N of atoms in free fall. In this case, you might look to squeeze to get a better signal, but that’s a lot of complexity for not much gain.

There are only 2 examples I know of where squeezing has made a difference to a real world measurement. LIGO, can’t increase photons without thermally heating the mirrors too much, and confocal microscopes looking at biological samples, cant turn up the laser power without burning the tissue. In 99% of cases, just increase N to make a better sensor.

Here is the paper

https://doi.org/10.48550/arXiv.2608.25563

And here is the easier to read press release from Q-CTRL with less errors and ad block black screens.

https://q-ctrl.com/blog/q-ctrl-achieves-worlds-first-gps-free-quantum-gravimetric-navigation-demonstration-in-maritime-field-trial

Here is the real article without the compounding editorial errors.

https://doi.org/10.48550/arXiv.2608.25563

You don’t. Any appropriately sensitive/accurate accelerometer or magnetometer is sufficient to do this.

The quantum part is 90% hype used to and attract funding. There are some advantages to the cold atom based sensors Q-CTRL makes, along with issues that need to be worked on, but they are other sensing technologies that could beat it in the long run.

I think you just hit what I subconsciously hated. It’s this underlying aggressive position and combative approach that I just don’t enjoy listening to. Like sure, John Deer or whoever is in the shit books this week deserves it, but I don’t want those vibes on my weekend.

Lewis Rossman.

I have no valid reason for this. I fundamentally agree with the guy on most things for the dozen or so vids I have seen. Right to repair etc etc.

But something about him just comes across as entitled and annoying. Like even if I knew the was right I would want to disagree with him.

I should watch this again.

There are also MOSFET based bypass panels that can achieve a similar effect at a far cheaper price point. Quite common here in Aus.

The high voltage DC strings are dangerous, but very price + power efficient and our install and wiring rules have made it quite safe.

microslop

All good mate, I mostly just try and stop the spread of misinformation on Aus gun laws. Most people don’t know much about them.

The leaver actions are fast. The main difference is that you can leave your finger on the trigger for a pump and are meant to take it off for the leaver action, though you could do it with your non trigger hand. People are also buying left handed bolt action shotguns to get around this, though it’s more awkward. All our shotguns have a capacity limit, usually 5 or less. It looks like these guys modified their barrel mags to hold more.

You’re not wrong about wasted ammo, reliability and reload speed, but you have to think about the worst case scenarios. Situation: close range, large dense crowd, shooter with an unreasonable amount of ammunition, and best luck in the world with no jams or reliability issues. That’s the formula for mass casualties. This is what our laws are effective at protecting against, primarily by limiting the rate of fire.

Can’t believe the guts that must have taken. Absolute legend.

Yeah no shit mate. That’s why pump shotguns are also under a cat C licence here. The legislators weren’t stupid, they basically categorised things on fire rate and public danger.

The Adler lever actions are very questionable in my opinion. They are almost as fast. Though the one I tried would jam all the time. Lever actions like that weren’t a common thing in the 90’s so it slipped by for a while.

And saying that a bolt action is potentially worse than a semi auto is some full on American bulshit. Sure things can jam and go wrong, but in the worst case situation with aresholes like this firing into a dense crowd where aim doesn’t really matter, faster shooting is more casualties.

A cat C license (self loading) is a lot more difficult to get than a cat A,B licence. So far this has worked, no semi auto terrorist attacks since Port Arthur. Thank fuck these guys did not have semi auto weapons.

I honestly wouldn’t have much issue with them removing the cat C licence, effectively banning semi auto outside of military use. But it certainly has some legitimate use cases in feral animal control.

https://arxiv.org/abs/2507.07209

I can’t stand these popular science articles that just cherry pick phrases from a paper. tl;dr it’s a very promising result but more observation of other galaxies or other mass consistent observations is needed before we should believe this.

However, the signal from the MW halo alone does not constitute the definitive proof of dark matter annihilation. Detection of annihilation signals from other objects or regions with consistent WIMP parameters will be crucial for the final confirmation. Gamma-ray observations of dwarf galaxies in the MW halo are fascinating from this perspective.

I would say the most exciting part is this gives us a mass range to optimise the search with earth based detectors. Start looking for 0.5-0.8 TeV masses.