Same government that buys dowsing rods for de-mining.
Royal Navy says quantum navigation test a success
11–20 of 279 posts
Re: Royal Navy says quantum navigation test a success
#12Is there any info on this from a reliable source? No idea what "quantum" means here. Remote entanglement? Some new kind of gyro? There's something called a "quantum gyroscope".[1] Those exist as lab devices. One good enough for a submarine seems not too big a jump. [1] https://physics.aps.org/articles/v8/11
The article links to a better article, https://news.sky.com/story/royal-navys-experimental-ship-car... , which calls the device an accelerometer. I think the article linked here got literally all its information from that other article. Apparently it's a small number of rubidium atoms, cooled to near-absolute zero, under which conditions they can apparently measure gravitational effects and make deductions from that…
》measure gravitational effects and make deductions from that ("measure extremely accurately the influence of gravity on their system
Aha! So it might be able to detect other submarines, even if they use some stealth tech.
Re: Royal Navy says quantum navigation test a success
#13This is the most obvious practical application of my PhD topic. A Bose Einstein Condensate is an extremely sensitive detector of gravity- a nuclear submarine could use it to make an ultra-accurate map of the world based on variations in the gravitational constant g. This would remove one of the primary reasons subs need to surface , in order to GPS lock.
It’s a naval chart that would not require surfacing.
A French postdoc in my lab swore this was the moneymaker for our entire subfield, and it seems he was on to something …
Re: Royal Navy says quantum navigation test a success
#14Earlier quoted context omitted.
The article links to a better article, https://news.sky.com/story/royal-navys-experimental-ship-car... , which calls the device an accelerometer. I think the article linked here got literally all its information from that other article. Apparently it's a small number of rubidium atoms, cooled to near-absolute zero, under which conditions they can apparently measure gravitational effects and make deductions from that…
》measure gravitational effects and make deductions from that ("measure extremely accurately the influence of gravity on their system Aha! So it might be able to detect other submarines, even if they use some stealth tech.
That sounds absurd, but the $5 pressure sensor on my weather station could detect a volcanic explosion 5,000 miles away.
Is there even a difference between a submarine and the surrounding water's gravitational fields when the sub has neutral buoyancy?
Re: Royal Navy says quantum navigation test a success
#15Is there any info on this from a reliable source? No idea what "quantum" means here. Remote entanglement? Some new kind of gyro? There's something called a "quantum gyroscope".[1] Those exist as lab devices. One good enough for a submarine seems not too big a jump. [1] https://physics.aps.org/articles/v8/11
The article lacks detail, but sounds like it's talking about something like an atomic gyroscope[1]. There are a few types of passive quantum navigation systems, but the principle is similar to a using a stopwatch and an old-school gyroscope to measure changes in momentum and then calculating your position via dead reckoning. It just sounds like quantum methods have let them get a lot more precise. This is actually pr…
Submarines have had good inertial navigation systems since the 1960s. Early gyros occupied about a cubic meter.[1] With a really big, heavy flywheel, it's easier to keep drift down. Nuclear submarines usually had three installed, for redundancy.
[1] https://www.ion.org/museum/item_view.cfm?cid=2&scid=4&iid=4
Re: Royal Navy says quantum navigation test a success
#16Earlier quoted context omitted.
The article links to a better article, https://news.sky.com/story/royal-navys-experimental-ship-car... , which calls the device an accelerometer. I think the article linked here got literally all its information from that other article. Apparently it's a small number of rubidium atoms, cooled to near-absolute zero, under which conditions they can apparently measure gravitational effects and make deductions from that…
》measure gravitational effects and make deductions from that ("measure extremely accurately the influence of gravity on their system Aha! So it might be able to detect other submarines, even if they use some stealth tech.
Submarines generally have neutral bouyancy while underway so there's not much density difference to discern.
Re: Royal Navy says quantum navigation test a success
#17The cover image certainly looks AI-generated. The rods on the top of the submarine seem oddly positioned.
the back half of the sub missing wasn’t what tipped you off that it wasn’t real?
Re: Royal Navy says quantum navigation test a success
#18This is the most obvious practical application of my PhD topic. A Bose Einstein Condensate is an extremely sensitive detector of gravity- a nuclear submarine could use it to make an ultra-accurate map of the world based on variations in the gravitational constant g. This would remove one of the primary reasons subs need to surface , in order to GPS lock. It’s a naval chart that would not require surfacing. A French p…
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Re: Royal Navy says quantum navigation test a success
#19This is the most obvious practical application of my PhD topic. A Bose Einstein Condensate is an extremely sensitive detector of gravity- a nuclear submarine could use it to make an ultra-accurate map of the world based on variations in the gravitational constant g. This would remove one of the primary reasons subs need to surface , in order to GPS lock. It’s a naval chart that would not require surfacing. A French p…
Fascinating. Q for you since you are so clued in.
I am a ham radio operator and was thinking about novel forms of signal propagation.
I landed on the idea of gravitons. Could gravitonic signal propagation be done somehow? While researching, I keep coming across familiar terms I know from radio land.
Just curious if the fields here could be harnessed for communication. Thanks.
Re: Royal Navy says quantum navigation test a success
#20This is the most obvious practical application of my PhD topic. A Bose Einstein Condensate is an extremely sensitive detector of gravity- a nuclear submarine could use it to make an ultra-accurate map of the world based on variations in the gravitational constant g. This would remove one of the primary reasons subs need to surface , in order to GPS lock. It’s a naval chart that would not require surfacing. A French p…
Yup and it's called is called Terrain Contour Matching!