Re: Quantum Cryptography can not work

I'm certainly not a fan of Quantum Cryptography, but I am convinced it works
in certain circumstances.

<azeltsman2@xxxxxxxxxxx> wrote in message
news:1172401726.784545.240830@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Some assume photon entanglement, which is an umpossibility. There is
no such thing as entanglement, period.

Since a quick google search for "photon entanglement" results in a number of
hits in notable publications (e.g. Nature
http://www.nature.com/nature/links/040311/040311-1.html) I have to side with
the professional physicists that are staking their reputation on this.

Others assume that evesdropper has to read the message directly using
polarization filters. It is not so.

Actually they only assume that quantum state duplication is not possible.

What if he uses a laser amplifier, making a number of identical
photones from initial one?

By adding energy to the system the total energy level of the system will
clearly rise, resulting in an increase in the number of photons, but more
importantly none of the photons will retain the original quantum state,
especially not the entanglement.

What do you think?

I think you are misunderstanding the arguments and/or physics involved.

The limitation of Quantum Cryptography has nothing to do with your
arguments, the problem is in routing. Just to enable my home router to work
with quantum cryptography would require making the router larger than my
apartment because of the connection requirements. For single hop connections
it is a wonderful solution, for multiple hop connections it is entirely
infeasible.
Joe


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