SETI - an alternate strategy

Quantum Entanglement Could Stretch Across Time

noreply@blogger.com (Bill St. Arnaud) — Mon, 24 Jan 2011 18:23:00 +0000

http://m.wired.com/wiredscience/2011/01/timelike-entanglement/

In the weird world of quantum physics, two linked particles can share a single fate, even when they’re miles apart.

Now, two physicists have mathematically described how this spooky effect, called entanglement, could also bind particles across time.

If their proposal can be tested, it could help process information in quantum computers and test physicists’ basic understanding of the universe.

“You can send your quantum state into the future without traversing the middle time,” said quantum physicist S. Jay Olson of Australia’s University of Queensland, lead author of the new study.

In ordinary entanglement, two particles (usually electrons or photons) are so intimately bound that they share one quantum state — spin, momentum and a host of other variables — between them. One particle always “knows” what the other is doing. Make a measurement on one member of an entangled pair, and the other changes immediately.

Physicists have figured out how to use entanglement to encrypt messages in uncrackable codes and build ultrafast computers. Entanglement can also help transmit encyclopedias’ worth of information from one place to another using only a few atoms, a protocol called quantum teleportation.

In a new paper posted on the physics preprint website arXiv.org, Olson and Queensland colleague Timothy Ralph perform the math to show how these same tricks can send quantum messages not only from place to place, but from the past to the future.

The equations involved defy simple mathematical explanation, but are intuitive: If it’s impossible to describe one particle without including the other, this logically extends to time as well as space.

“If you use our timelike entanglement, you find that [a quantum message] moves in time, while skipping over the intermediate points,” Olson said. “There really is no difference mathematically. Whatever you can do with ordinary entanglement, you should be able to do with timelike entanglement.”

Olson explained them with a Star Trek analogy. In one episode, “beam me up” teleportation expert Scotty is stranded on a distant planet with limited air supply. To survive, Scotty freezes himself in the transporter, awaiting rescue. When the Enterprise arrives decades later, Scotty steps out of the machine without having aged a day.

“It’s not time travel as you would ordinarily think of it, where it’s like, poof! You’re in the future,” Olson said. “But you get to skip the intervening time.”

According to quantum physicist Ivette Fuentes of the University of Nottingham, who saw Olson and Ralph present the work at a conference, it’s “one of the most interesting results” published in the last year.

“It stimulated our imaginations,” said Fuentes. “We know entanglement is a resource and we can do very interesting things with it, like quantum teleportation and quantum cryptography. We might be able to exploit this new entanglement to do interesting things.”

One such interesting thing could involve storing information in black holes, said physicist Jorma Louko, also of the University of Nottingham.

“They show that you can use the vacuum, that no-particle state, to store a lot of information in just a couple of atoms, and recover that info from other atoms later on,” Louko said. “The details of that have not been worked out, but I can foresee that the ideas that these authors use could be adapted to the black hole context.”

Entanglement in time could also be used to investigate as-yet-untested fundamentals of particle physics. In the 1970s, physicist Bill Unruh predicted that, if a spaceship accelerates through the empty space of a vacuum, particles should appear to pop out of the void. Particles carry energy, so they would be, in effect, a warm bath. Wave a thermometer outside, and it would record a positive temperature.

Called the Unruh effect, this is a solid prediction of quantum field theory. It’s never been observed, however, as a spaceship would have to accelerate at as-yet-unrealistic speeds to generate an effect large enough to be testable. But because timelike entanglement also involves particles emerging from vacuums, it could be used to conduct more convenient searches, relying on time rather than space.

Finding the Unruh effect would provide support for quantum field theory. But it might be even more exciting not to see the effect, Olson said.

“It would be more of a shocking result,” Olson said. “If you didn’t see it, something would be very wrong with our understanding.”

Image: flickr/Darren Tunnicliff

Orbital Angular Momentum – Bo Thide and Jan Bergman (SETI Talks)

noreply@blogger.com (Bill St. Arnaud) — Wed, 28 Jul 2010 13:51:00 +0000

Link to SETI Archive: seti.org On the extraction of all information embedded in radio siganls: Implications for SETI: A new idea for utilizing all of the information in photons for communication involves a little-know electromagnetic property: the photon’s orbital angular momentum (POAM). The communication and computer industries are actively looking at the possibilities. We will discuss current research and the implications for SETI.

http://ufo-tv.com/orbital-angular-momentum-bo-thide-and-jan-bergman-seti-talks

Want to leave a message for whatever comes next?

noreply@blogger.com (Bill St. Arnaud) — Tue, 18 Nov 2008 20:28:00 +0000

http://en.wikipedia.org/wiki/KEO

KEO
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For the Cypriot company see KEO Ltd

KEO is a space time capsule which will be launched in 2010 or 2011[1] carrying messages from the citizens of present Earth to humanity 50,000 years from now, when it will reenter Earth's atmosphere.

The KEO project is supported by UNESCO (who voted it "Project of the 21st century"), Hutchison Whampoa and the European Space Agency, among other institutions. Its name is supposed to represent the three most frequently used sounds common to the most widely spoken languages today, [k], [e] and [o],[2] though this is in fact mistaken, as the most common sound is [a].[3]
Contents

* 1 Personal messages
* 2 Other contents
* 3 Technical aspects
* 4 Project history
* 5 Similar Projects
* 6 See also
* 7 Notes
* 8 References
* 9 External links

[edit] Personal messages

Every person is invited to write a message addressed to the future inhabitants—the deadline is December 31, 2009. Messages can be posted via the the project's website, or sent by postal mail. The organizers encourage everybody to gather messages from children, senior citizens and the illiterate so that every culture and demographic on Earth is represented. The satellite has enough capacity to carry a four-page message from each of the more than six billion inhabitants on the planet. Once the satellite is launched, the messages (with personal names removed) will be made freely available on the web.

[edit] Other contents

KEO will also carry a diamond that encases a drop of human blood chosen at random and samples of air, sea water and earth.[4] The DNA of the human genome will be engraved on one of the faces. The satellite will also carry an astronomical clock that shows the current rotation rates of several pulsars; photographs of people of all cultures; and "the contemporary Library of Alexandria", an encyclopaedic compendium of current human knowledge.

[edit] Technical aspects

The messages and library will be encoded in glass-made radiation-resistant DVDs. Symbolic instructions in several formats will show the future finders how to build a DVD reader.

The satellite itself is a hollow sphere 80 cm in diameter. The sphere is engraved with a map of Earth and surrounded by an aluminium layer, a thermal layer and several layers of titanium and other heavy materials intertwined with vacuum. The sphere is resistant to cosmic radiation, atmosphere re-entry, space junk impacts and so on. For its first few years in orbit, KEO will sport an artful pair of wings 10 meters across that will aid in its spotting from Earth. As the satellite enters the atmosphere, the thermal layer will produce an artificial aurora to give a signal of the satellite's re-entry. The passive satellite will not carry any communications or propulsion systems. It will be launched by an Ariane 5 rocket into an orbit 1,800 km high, an altitude that will bring it back to Earth in 500 centuries, the same amount of time that has elapsed since early humans started to draw in cavern walls.

The satellite has not been built and no contract has been tendered for its construction.

[edit] Project history

The KEO project was conceived in 1994 by French artist-scientist Jean-Marc Philippe, a pioneer of space art. Messages began to be collected, and an initial launch date was set for 2001. Technical feasibility demonstration and other various delays have moved the launch date to 2010 or 2011.

[edit] Similar Projects

Several previous spacecraft have included time capsules for humans (or aliens) in the far future. The Apollo 11 Lunar Module (now on the moon) includes a plaque showing the arrangement of the Earth's continents in 1969. The LAGEOS satellite (which will re-enter the atmosphere in 8.4 million years) contains a plaque showing the arrangement of the Earth's continents in the past, present, and future. Pioneer 10 and Pioneer 11 both contain plaques that give pictorial information about their time and place of origin. Most famously, the two Voyager spacecraft each contain a golden record that contains pictures and sounds of Earth, along with symbolic directions for playing the record and data detailing the location of Earth. The Pioneers and Voyagers have left the solar system for interstellar space.

[edit] See also

* Bracewell probe
* Crypt of Civilization
* Westinghouse Time Capsules

[edit] Notes

1. ^ Current launch date estimation
2. ^ Official FAQ page
3. ^ Ian Maddieson and Sandra Ferrari Disner, 1984, Patterns of Sounds. Cambridge University Press
4. ^ Edge Life Magazine, May 2003

[edit] References

* Bridges, Andrew (Jul. 31, 2000). KEO: The 50,000-Year Mission to Earth Space.com
* Stenger, Richard (Aug. 29, 2000). KEO time capsule could remain in orbit until 52001 AD CNN.com
* HowStuffWorks.com (Sept. 5, 2000). Time Capsule to Orbit Earth for 50,000 Years HowStuffWorks.com
* The Hindu Business Line (Aug. 29, 2002). Hutch brings space-time capsule project to India The Hindu Business Line
* ChennaiOnline.com (Sept. 4, 2002). KEO, a time capsule in space! ChennaiOnline.com
* The Digital Skyline (August 2003). A Message to the Future The Digital Skyline
* Ashraf, Syed Firdaus (Oct. 15, 2003). Once upon a time, 50,000 years ago... Rediff.com
* EUROPA (May. 28, 2004). New satellite carries hopes and dreams of humanity EUROPA

[edit] External links

Special Constellations that Nature would never produce

noreply@blogger.com (Bill St. Arnaud) — Mon, 25 Feb 2008 19:00:00 +0000

[I think Jaron's idea is very similar to my own that we need to build "galactic" pyramids and other artificial structures in space. But rather than moving stars and planets I think this can be done more practically by creating spatial spectral patterns that clearly would be the mark of intelligence. Using gravitational lensing as Raman amplifiers and optical circulators could possibly keep a signal radiating forever-- BSA]

A proposal to create special constellations that nature
would never produce

by Jaron Lanier

This month I seriously propose that we begin the process
of repositioning the sun and other nearby stars in order to send signals to aliens, and that we begin the search for signs that aliens might have done the same for our benefit.

Full article here:

http://discovermagazine.com/2008/feb/rearranging-stars-to-communicate-with-aliens

Orbital Angular Momentum for SETI signaling

noreply@blogger.com (Bill St. Arnaud) — Tue, 05 Feb 2008 19:15:00 +0000

I have always been fascinated by Orbital Angular Momentum for another applications including deep space communications. Here is a quick article on the subkect

http://www.space.com/searchforlife/080131-seti-galactic-wifi.html

Also excellent overview paper on OAM

http://www.physics.irfu.se/Publications/Presentations/ThideEtBergman%3ACSC_SETI%3A2008.pdf

Channels versus Platforms for communication

noreply@blogger.com (Bill St. Arnaud) — Wed, 16 Jan 2008 17:46:00 +0000

[Google has a web site on the best of their research videos. Lots of excellent material - but the one I particularly recommend is Van Jacobson's talk on the future of the Net. Anybody who is doing research on next generation Internet and/or native XML/URI routing, repositories and peer to peer architectures should be interested in this talk. His basic premise is that Netheads are in danger of being caught in the similar closed mindset of how networks should be designed much in the same way that Bellhead researchers were trapped by circuit switching modality. His argument was that the current Internet is ideally designed for conversations between devices, while what we need now is global pltaform the dissemination of information.

In terms of SETI this means that we have to stop thinking of "communicating" with ETs by looking for communication channels, but instead look for and"join" inter-galactic discussion boards - sort of an intergalactic Facebook--BSA]

Van Jacobson's talk: http://video.google.com/videoplay?docid=-6972678839686672840&q=engedu Today's research community congratulates itself for the success of the internet and passionately argues whether circuits or datagrams are the One True Way. Meanwhile the list of unsolved problems grows. Security, mobility, ubiquitous computing, wireless, autonomous sensors, content distribution, digital divide, third world infrastructure, etc., are all poorly served by what's available from either the research community or the marketplace. I'll use various strained analogies and contrived examples to argue that network research is moribund because the only thing it knows how to do is fill in the details of a conversation between two applications. Today as in the 60s problems go unsolved due to our tunnel vision and not because of their intrinsic difficulty. And now, like then, simply changing our point of view may make many hard things easy

David Brin talks on SETI

noreply@blogger.com (Bill St. Arnaud) — Mon, 14 Jan 2008 20:54:00 +0000

David Brin talks about SETI and many other things.

http://thesciencenetwork.org/BeyondBelief2/watch/brin.php