[15291] in cryptography@c2.net mail archive
Re: my periodic rant on quantum crypto
daemon@ATHENA.MIT.EDU (David Honig)
Wed Apr 14 10:45:57 2004
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 12 Apr 2004 19:49:40 -0700
To: cryptography@metzdowd.com
From: David Honig <dahonig@cox.net>
In-Reply-To: <874qrpj8ci.fsf@snark.piermont.com>
At 03:37 PM 4/12/04 -0400, Perry E. Metzger wrote:
>
>QC can only run over a dedicated fiber over a short run, where more
>normal mechanisms can work fine over any sort of medium -- copper, the
>PSTN, the internet, etc, and can operate without distance limitation.
Nice essay. I especially liked the discussion of authentication.
Its also the case AFAIK that the quantum-carrying fiber
can only carry one photon at a time. (Perhaps you can multiplex
different frequencies, if your demultiplexor doesn't change the
quantum properties). Now while there *is* a lot of dark fiber,
sending one photon at a time is a pretty good way to keep the
construction crews digging up roads :-)
Similar quantum-hype is sometimes argued in RNG discussions
by those with very narrow views of what an RNG needs and
consists of.
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