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Single-Ion Clock 100 Times More Accurate Than Atomic Clock
New submitter labnet writes with this excerpt from news.com.au: "University of New South Wales School of Physics professor Victor Flambaum has found a method of timekeeping nearly 100 times more accurate than the best atomic clocks. By using the orbit of a neutron around an atomic nucleus he says the system stays accurate to within 1/20th of a second over billions of years. Although perhaps not for daily use, the technology could prove valuable in science experiments where chronological accuracy is paramount, Prof Flambaum said."
until it comes with indiglo i don't want it
Eventually you'll be so accurate that walking by the thing will cause enough relativistic distortions that you can no longer claim to have any accuracy at all.
You kidding me? The prospect of GPS-guided bullets accurate to the millimeter will have the US military pursuing this in next-gen GPS satellites as soon as the technology is viable. Hell, this'll be the most valuable update to military hardware in decades.
Viable Slashdot alternatives: https://pipedot.org/ and http://soylentnews.org/
http://arxiv.org/abs/1110.2490
And here I was, thinking that neutrons were inside the nucleus and electrons were orbiting around it. What's going on here? How can a neutron orbit a nucleus? It's an actual question, I know the atomic models I was once taught are way out of date (by a couple of centuries, probably), but I never heard of neutrons orbiting nuclei.
It'd be nice if some physics professor *cough* could solve those problems before making some shit that can be accurate for a billion years! See what I did there? That was just passive aggressive right there, wasn't it? Too much Portal, lately...
I'm trying to teach myself to set people on fire with my mind... Is it hot in here?
A preprint is available on arXiv at http://arxiv.org/abs/1110.2490
A nuclear transition in triply-ionized 229Th has been found which is particularly insensitive to external magnetic fields and electron configuration, which gives the potential for a very stable clock,several orders of magnitude better than current clocks if phase comparisons can be made across a scale of days or weeks. The transition energy is at 163nm (in the ultraviolet). To take advantage of this clock an extremely stable laser at this wavelength (using current best clocks) will need to be created.
Yes, because being off by 2 seconds every billion years is something to worry about. I am sick of having to adjust my watch for the inaccuracy of atomic clocks.
a OC-192 fiber line transmits 10 gigs/sec, roughly.
If you stuck one of those "2 secs/gigayear" clocks on each end, instead of regenerating the clock off the line, I think the circuit would lose line sync and drop every:
365*24*60*60 /10 /2 / 6/60/60/24 = every 18.2 days. Bummer.
Lets check. 10 gigabits/sec at 18.2 days is 18.2*24*60*60*10*1e9 is 1.57e16 bits. 2 secs/gigayear is an error rate of 1e9*365*24*60*60/2 is 1.57e16 bits per clock framing failure. Seems likely.
That is why now a days you get your clock off the line instead of internal clocking at each site. In ye olden T-1 era, a clock that good at each CO would mean you'd probably never experience a clock slip between COs in the lifetime of the equipment... Even in ye olden days we internal timed quite a bit (and some of our DEXCS only could do internal, so we had to)
"Science flies us to the moon. Religion flies us into buildings." - Victor Stenger