Posts Tagged ‘neutrinos’
[NEWS] Four science links: neutrinos and Antarctica, ‘Oumuamua, Ceres and Pluto, panspermia
- This feature explaining how neutrino telescopes in Antarctica are being used to study the Earth’s core is fascinating. The Globe and Mail has it.
- Universe Today shares “Project Lyra”, a proposal for an unmanned probe to interstellar asteroid ‘Oumuamua.
- Dwarf planets Ceres and Pluto, Nora Redd suggests at Discover, may have much more in common than we might think. Is Ceres a KBO transported into the warm asteroid belt?
- Universe Today reports on one paper that takes a look at some mechanisms behind galactic panspermia.
[LINK] “Tomorrow’s stocks could be traded via neutrino beam”
I blogged at the end of March about the apparent birth, in Chicago’s Fermilab, of the first generation of neutrino communications systems. I shared the speculation at the time that communications systems using neutrinos, those elementary particles which travel at the speed of light and hardly intersect matter at all, would be useful in communications with space probes and submarines, i.e. vehicles out of communication for long periods of time because conventional electromagnetic communications systems are blocked by massive quantities of matter. (Oceans, say, or planets.) Now, io9 notes that neutrino communications systems might be useful for stock trading.
Neutrinos may not travel faster than light, but that doesn’t mean they can’t be put to good use. By sending encoded pulses of neutrinos on a 10,000 km shortcut directly through the Earth, financial firms and high-frequency trading companies think they can get a 44-millisecond communication advantage over their competitors.
That might not sound like much of an edge, but in a world where hundreds of millions of dollars change virtual hands in just fractions of a second, even milliseconds become significant.
“Thirty milliseconds is a lot of time in high-velocity trading,” explains former J.P. Morgan Chase options trader Espen Gaarder Haug in an interview with Forbes Magazine.
According to Haug, cities with the greatest distance between them would stand to gain the biggest time boost. Communication between New York and Tokyo would see a 23.7 millisecond time advantage; communications between London and Sydney would see almost double that.
Of course, financial institutions still need the infrastructure to make this all happen, which would basically require a particle accelerator beneath any firm that wanted in on the latest, greatest trading trend. And while that’s not likely to happen anytime soon, something tells us that as soon as one of these firms takes the plunge on neutrino-communication, the rest of them are liable to follow suit.
[BRIEF NOTE] On the latest breakthrough in neutrino communication systems
It’s a minor surprise that the Economist has become my go-to site for breakthroughs in neutrino-based communications.
The neutrino is a unique particle, an exceptionally light and electrically neutral that’s most notable for traveling almost exactly at the speed of light (likely just short of the speed of light, notwithstanding debunked claims of faster-than-light travel) and for hardly interacting with normal matter at all. To be sure of intercepting the average neutrino produced by the sun in the course of its nuclear fusion, you’d need a solid barrier of lead one light-year thick. The difficulty of intercepting neutrinos makes them of interest to scientists who are interested in examining environments impervious to the electromagnetic spectrum, places like the interior of the sun (or other stars).
More recently, the durability of the neutrino has made people interested in extraterrestrial intelligences wonder if advanced civilizations might make use of neutrinos to create unstoppable signals across interstellar distances. I first came across the idea in this 2009 Centauri Dreams post speculating about Antarctic neutrino observatory, but a 2011 article from the Economist went into greater detail, suggesting that neutrino beams could be used not only as signals but as awesome tools that could manipulate the fluctuations of Cepheid variable stars into intelligible signals. An article printed this month announced that, for the first time, neutrinos have been used to communicate data. This news was expanded upon by a post at the Economist‘s technology blog, Babbage. The facilities of Fermilab in Chicago, including the MINERvA neutrino detector, were key.
MINERvA uses a beam of neutrinos sent from Fermilab’s accelerator, the Main Injector, to a detector roughly 1km (0.6 miles) away. The beam is created by smashing pulsed bunches of trillions of protons into a graphite target. For a week before the start of a maintenance break, however, it runs at half its typical intensity, not ideal for MINERvA’s day job, but just dandy for the communications test. (The data collected are nonetheless used for MINERvA’s everyday research.)
The detector is hidden underground to ensure that the rare events observed in it are due to neutrinos and not cosmic rays, which do not penetrate rock. As a result, the experiment’s neutrinos must travel 240 metres through the Earth’s crust, precisely the sort of thing the theorists envisaged.
The message, which read “neutrino”, was transcribed into a string of “0s” and “1s” using the standard code employed in digital communications. The beam was then tweaked so that a pulse created using a full bunch of protons corresponded to a “1”, while one with no protons signalled a “0”. The pulses were separated by 2.2 seconds and the message was repeated in cycle for about two hours.
At the receiving end, each “1” translated into an average of 0.8 neutrino events registered in the detector; a “0”, naturally, translated into none. This was enough to reconstruct the message accurately.
Practical neutrino-phones are, of course, a long way off. For a start, the data-transmission rate, at a piddling 0.1 bits per second with a bit error rate of 1%, leaves a lot to be desired, though it could be improved with a more intense beam, which would anyway be required to send messages over long distances. A bigger problem is that MINERvA’s detector, at 5 metres long, 3.5 metres high and weighing 170 tonnes, is not exactly portable. And the Main Injector is many times heftier still. All the same, who said fundamental physics has no real-world applications?
The paper in question is “Demonstration of Communication using Neutrinos”, available at arXiv.
That site’s blog suggested one practical use for neutrino communications systems, in communicating with underwater craft like submarines. When submerged, submarines can communicate with surface facilities only through extremely low frequency (ELF) radio waves that firstly can only penetrate a hundred or so metres and secondly can only transmit around 50 bits per second. A neutrino-based communications system that transmitted at comparable speeds and could be picked up at unlimited depths anywhere on the world’s oceans would be an obvious replacement for ELF radio. As the blog notes the data transmission rate for neutrino communications systems would need to be improved by several orders of magnitude, while the bulkiness of the detector systems–MINERvA masses five tons–is another issue. Still, I’m not inclined to bet against further progress in this domain.