Is concurrency hard?
Marc van Woerkom
Wed Nov 2 13:11:49 CET 2005
>On dear - who is right? - both - it is the question that
>is silly - you cannot ask questions about
>the simultaneity of event occurring at different places
Each one has his own correct point of view about the
events happening, and it is possible to find out what is
going on in another observer's local coordinate frame (one
knows the proper transformations).
>Now in physics there is no concept of sharing and no
>concept of simultaneity at
>a distance. We can only say that two things occur at the
>same time if they occur at the same place.
The theory of relativity has abandoned absolute time, that
One the other hand we have that strange world of quantum
There you have the odd phenomenon of coupled states.
E.g. certain radioactive isotopes have an event, where two
photons are emitted in opposite directions. The
polarisation of the photons is undetermined at first.
But if you measure one photon, and thus force nature to
make a choice, instantenously the other photon takes the
The interesting bit is that people start to employ such
odd quantum effects to create unique and potentially more
powerful computing devices.
The world is quantum, not classical, so let's use that!
Read a text on quantumn computing to see what interesting
combination of theoretical computer science and quantum
physics has been developed so far.
E.g. the above mentioned coupled photons are used to
realize secure communication channels.
>In physics, light propagates through a media (called the
>ether) - but nobody
>knows what the ether is.
Since 100 years, the annus mirabilis of Albert Einstein,
ether has been abandoned.
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