On Sun, Sep 21, 2003 at 01:37:21PM +0100, Peter Fairbrother wrote:
[cloning photons]
> There is also another less noisy cloning technique which has recently been
> done in laboratories, though it doubles the photon's wavelength, which would
> be noticeable,

To get rid of the wavelength change it sounds like you "just" have to
produce a new photon with half the wavelength, clone it and then clone
one of the clones and measure whether it matches the intercepted one. If
it does, forward its clone, otherwise choose another one.

I am a little skeptic though, does this really work? I would expect that
measuring one clone would affect its twin just as if it was measured


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