Re: interesting article on quantum cryptography
- From: "Douglas A. Gwyn" <DAGwyn@xxxxxxxx>
- Date: Thu, 26 Apr 2007 21:51:29 GMT
Antony Clements wrote:
that's a good question, the article specifically cites photons, but i don't
see any reason why it wouldnt work with any other particle that has a
suitable quantum property, but then the additional question arises, what is
a suitable quantum property.
Photons were chosen for practical reasons.
Optical labs already have lasers, beam splitters, polarizers, etc.
The specific property is the ability to create particle *pairs*
that are entangled with each other. The entanglement relationship
essentially means that observing one particle's state (polarization
for example) appears to affect a similar observation of the other
particle. You can look up "quantum entanglement" in the Wikipedia
for further information about this phenomenon.
.
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