Re: Quantum cryptography: a flawed premise?

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Article #1244

#1244

From: Tom Knight
Date: Wed, 14 Oct 1992 19:04

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Once more with feeling... You Can't Clone Quantum States.  If you
could, then you could copy a particle, measure its wave function in
one axis, the other particle in the other axis, and violate the
uncertainty principle.  You can't.

Lasers and laser-like amplifiers DO maintain polarization for incoming
beams with large numbers of photons.  They do not for incoming single
photons.  All of the photons coming out of the amplifier will be in
the same state (nearly), but this state is NOT RELIABLY IDENTICAL to the
incoming (single) photon state.

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References: <141@lorien.OCF.LLNL.GOV> <TK.92Oct12131052@entropy.ai.mit.edu> <1992Oct12.184051.1@zodiac.rutgers.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!snorkelwacker.mit.edu!ai-lab!life!tk
From: tk@ai.mit.edu (Tom Knight)
Newsgroups: sci.crypt
Subject: Re: Quantum cryptography: a flawed premise?
Message-ID: <TK.92Oct14150437@entropy.ai.mit.edu>
Date: 14 Oct 92 19:04:37 GMT
References: <141@lorien.OCF.LLNL.GOV> <TK.92Oct12131052@entropy.ai.mit.edu>
 <1992Oct12.184051.1@zodiac.rutgers.edu>
Sender: news@ai.mit.edu
Organization: MIT Artificial Intelligence Laboratory
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In-reply-to: leichter@zodiac.rutgers.edu's message of 12 Oct 92 22:40:51 GMT

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