Re: Quantum Cryptography can not work
- From: Mike Amling <spamonly@xxxxxxxxxxx>
- Date: 25 Feb 2007 16:21:56 EST
Peter Pearson wrote:
On 25 Feb 2007 03:08:46 -0800, azeltsman2@xxxxxxxxxxx wrote:
[snip]
What if he uses a laser amplifier, making a number of identical
photones from initial one? And then sending one of them to the
receiver?
As I understand it, you cannot clone photons, even with a
laser amplifier. I am not a physicist, but when quantum
cryptography was invented I worked among laser physicists,
and I asked around (and got contradictory answers). Among
much unfamiliar stuff was the notion that the medium of your
laser amplifier inevitably has a nonzero probability of
spontaneous emission, which would preserve the necessary
uncertainty over the state of the original photon.
The probability of emission into a given state is proportional to 1 plus the number of photons already in that state, if I recall Einstein's formula correctly. So, the amplifier is more likely to emit a clone of the input photon than a photon in any other state.
--Mike Amling
.
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