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Date: Tue, 4 Nov 2003 11:11:46 -0500
Subject: Physics News Update 660

The American Institute of Physics Bulletin of Physics News
Number 660 November 4, 2003   by Phillip F. Schewe, Ben Stein, and
James Riordon

(Paul Alsing, University of New Mexico, 505-277-9094,
[EMAIL PROTECTED]). In quantum teleportation (see
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)

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