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Am 27. September 2006 hielt Charles H. Bennett (IBM Research Center,
New York) im Kleinen Hörsaal des Instituts für
Experimentalphysik einen Vortrag zum Thema Quanteninformation. Im
Abstract sagt er dazu:
»The most private information, exemplified by a quantum eraser experiment, exists
only conditionally and temporarily – after the experiment is over, even
God has forgotten what happened. Less private are classical secrets, facts known
only to a few, or information – like the lost poems of Sappho – that
once was public but has now been forgotten. Finally there is information that
has been replicated and propagated so widely as to be infeasible to conceal and
unlikely to be forgotten. Modern information technology has caused an explosion
of such information, with the beneficial side effect of making it harder for
despots to rewrite the history of their misdeeds; and it is tempting to hope that
all macroscopic information is permanent, making such cover-ups impossible in
principle. However, by comparing entropy flows into and out of the Earth with
estimates of the planet's storage capacity, we conclude that most macroscopic
information – for example the pattern of sand grains on an ancient beach – is
impermanent, in the sense of becoming irrecoverable by terrestrial observers
while still recorded in the Universe.«
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