----- Forwarded message from [EMAIL PROTECTED] ----- From: [EMAIL PROTECTED] Date: Tue, 4 Nov 2003 11:11:46 -0500 To: [EMAIL PROTECTED] Subject: Physics News Update 660 Reply-To: [EMAIL PROTECTED]
PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 660 November 4, 2003 by Phillip F. Schewe, Ben Stein, and James Riordon [...] ACCELERATION DISRUPTS QUANTUM TELEPORTATION, a new study has shown (Paul Alsing, University of New Mexico, 505-277-9094, [EMAIL PROTECTED]). In quantum teleportation (see http://www.aip.org/enews/physnews/1997/split/pnu350-1.htm), researchers create a pair of particles (such as photons) and cause them to interact so their properties become interrelated (a process called "entanglement"). Subsequently, after the particles go their separate ways, one can measure the first particle's properties (such as the direction its electric field is wiggling), destroy the particle (a requirement), and then instantly transmit (or "teleport") its exact properties to the second particle, even if it ends up being light years away. Quantum teleportation is different from Star Trek teleportation in that real-life physicists are only teleporting a particle's properties, rather than the particle itself. Now, a new analysis has shown that quantum teleportation would malfunction if the receiver of the second particle is accelerating relative to the first particle. (Coincidentally, spaceships in Star Trek usually don't teleport crew members when they accelerate into warp drive.) The disruption to quantum teleportation arises from the Davis-Unruh effect (see http://focus.aps.org/story/v8/st19), in which acceleration, even in empty space, creates a bath of hot particles resulting from the energy of the acceleration. This thermal bath of particles inextricably disrupts the receiver's ability to perfectly recreate (with the second accelerated particle) the properties of the first (unaccelerated) particle that have been teleported from the sender. While this effect is small for typical accelerations in Earthly labs the result shows an interesting relationship between the effects of space-time motion and the quantum world. (Alsing and Milburn, Physical Review Letters, 31 October 2003) [...] *********** PHYSICS NEWS UPDATE is a digest of physics news items arising from physics meetings, physics journals, newspapers and magazines, and other news sources. It is provided free of charge as a way of broadly disseminating information about physics and physicists. For that reason, you are free to post it, if you like, where others can read it, providing only that you credit AIP. Physics News Update appears approximately once a week. AUTO-SUBSCRIPTION OR DELETION: By using the expression "subscribe physnews" in your e-mail message, you will have automatically added the address from which your message was sent to the distribution list for Physics News Update. If you use the "signoff physnews" expression in your e-mail message, the address in your message header will be deleted from the distribution list. Please send your message to: [EMAIL PROTECTED] (Leave the "Subject:" line blank.) ----- End forwarded message ----- -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> ______________________________________________________________ ICBM: 48.07078, 11.61144 http://www.leitl.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE
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