[quote] It has long been known that an accelerated observer detects a
thermal bath of particles whereas an observer at rest sees only a
vacuum. Known as the Unruh effect, it is this that causes the
degradation in the entanglement measured by Alice and Rob. Our results
are a first step in understanding how relativistic effects modify
quantum information, and they imply that different observers detect
different degrees of entanglement. FROM
http://www.eurekalert.org/pub_releases/2005-08/pift-afi081205.php
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