davidh
May 19th, 2006, 12:58 AM
I happened to run across this while testing out the Google blog search.
QUOTE
Quantum Game Theory arXiv Nash equilibria and game theory profoundly affected the outcome of the 20th Century – preventing escalation of Cold War conflict between the US and USSR, for example. Quantum game theoretic approaches similarly hold the potential to influence strategic developments in the coming century. Quantum communications networks are already operating in research laboratories across the globe. With the recent birth of the DARPA/BBN quantum internet, quantum game theory has left the realm of academia and entered the world of practical applications, showing promise to transform politics, economics, conflict and warfare in the decades to come. In a recent PhD thesis, Iqbal reviews the current state of the field. See also "Quantum Pseudo-Telepathy" by Brassard et al, "Classical Rules in Quantum Games" by van Enk, "Quantum Strategies" by Meyer.
- posted by coherence * @ 08:40 Comments | Trackback
UNQUOTE
http://superconducting.blogspot.com/2005/04/quantum-interference-effect.html
How much of this is true is a good question. Don't ask me. Some of it sounds plausible. I'm not motivated yet to try to track down the credentials of any of these referenced persons or organizations.
If you get bored with crossword puzzles, then some of the math in some of those papers would probably keep you occupied.
I don't know how to compare the relative difficulty of quantum communications versus quantum computing. However, one might take the analogy between digital communication (e.g. telegraph/Samuel Morse) and digital computing (von Neuman) as a guideline. There was almost a 100 year gap between those two. So to me it does not seem so implausible that DARPA is working on quantum communication (using the principle of entanglement, etc.).
David H.
P.S.
It would be interesting to find out if anyone has actually measured the speed of quantum communication. Even the old Michelson 1879 experiment to measure the speed of light still seems interesting to me today. I wonder what kind of apparatus they might use today to measure the speed of quantum entanglement? (That is, besides using the universe itself and gravitational lenses as the apparatus, as proposed by one of the SETI scientists.)
QUOTE
The Michelson-Morley Experiment
Michael Fowler
U. Va. Physics
The Nature of Light
As a result of Michelson's efforts in 1879, the speed of light was known to be 186,350 miles per second with a likely error of around 30 miles per second. This measurement, made by timing a flash of light travelling between mirrors in Annapolis, agreed well with less direct measurements based on astronomical observations. Still, this did not really clarify the nature of light. Two hundred years earlier, Newton had suggested that light consists of tiny particles generated in a hot object, which spray out at very high speed, bounce off other objects, and are detected by our eyes. Newton's arch-enemy Robert Hooke, on the other hand, thought that light must be a kind of wave motion, like sound. To appreciate his point of view, let us briefly review the nature of sound.
The Wavelike Nature of Sound
Actually, sound was already quite well understood by the ancient Greeks. The essential point they had realized is that sound is generated by a vibrating material object, such as a bell, a string or a drumhead. Their explanation was that the vibrating drumhead, for example, alternately pushes and pulls on the air directly above it, sending out waves of compression and decompression (known as rarefaction), like the expanding circles of ripples from a disturbance on the surface of a pond. .....
UNQUOTE
http://galileoandeinstein.physics.virginia.edu/lectures/michelson.html
QUOTE
Quantum Game Theory arXiv Nash equilibria and game theory profoundly affected the outcome of the 20th Century – preventing escalation of Cold War conflict between the US and USSR, for example. Quantum game theoretic approaches similarly hold the potential to influence strategic developments in the coming century. Quantum communications networks are already operating in research laboratories across the globe. With the recent birth of the DARPA/BBN quantum internet, quantum game theory has left the realm of academia and entered the world of practical applications, showing promise to transform politics, economics, conflict and warfare in the decades to come. In a recent PhD thesis, Iqbal reviews the current state of the field. See also "Quantum Pseudo-Telepathy" by Brassard et al, "Classical Rules in Quantum Games" by van Enk, "Quantum Strategies" by Meyer.
- posted by coherence * @ 08:40 Comments | Trackback
UNQUOTE
http://superconducting.blogspot.com/2005/04/quantum-interference-effect.html
How much of this is true is a good question. Don't ask me. Some of it sounds plausible. I'm not motivated yet to try to track down the credentials of any of these referenced persons or organizations.
If you get bored with crossword puzzles, then some of the math in some of those papers would probably keep you occupied.
I don't know how to compare the relative difficulty of quantum communications versus quantum computing. However, one might take the analogy between digital communication (e.g. telegraph/Samuel Morse) and digital computing (von Neuman) as a guideline. There was almost a 100 year gap between those two. So to me it does not seem so implausible that DARPA is working on quantum communication (using the principle of entanglement, etc.).
David H.
P.S.
It would be interesting to find out if anyone has actually measured the speed of quantum communication. Even the old Michelson 1879 experiment to measure the speed of light still seems interesting to me today. I wonder what kind of apparatus they might use today to measure the speed of quantum entanglement? (That is, besides using the universe itself and gravitational lenses as the apparatus, as proposed by one of the SETI scientists.)
QUOTE
The Michelson-Morley Experiment
Michael Fowler
U. Va. Physics
The Nature of Light
As a result of Michelson's efforts in 1879, the speed of light was known to be 186,350 miles per second with a likely error of around 30 miles per second. This measurement, made by timing a flash of light travelling between mirrors in Annapolis, agreed well with less direct measurements based on astronomical observations. Still, this did not really clarify the nature of light. Two hundred years earlier, Newton had suggested that light consists of tiny particles generated in a hot object, which spray out at very high speed, bounce off other objects, and are detected by our eyes. Newton's arch-enemy Robert Hooke, on the other hand, thought that light must be a kind of wave motion, like sound. To appreciate his point of view, let us briefly review the nature of sound.
The Wavelike Nature of Sound
Actually, sound was already quite well understood by the ancient Greeks. The essential point they had realized is that sound is generated by a vibrating material object, such as a bell, a string or a drumhead. Their explanation was that the vibrating drumhead, for example, alternately pushes and pulls on the air directly above it, sending out waves of compression and decompression (known as rarefaction), like the expanding circles of ripples from a disturbance on the surface of a pond. .....
UNQUOTE
http://galileoandeinstein.physics.virginia.edu/lectures/michelson.html