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While great in theory, the premise of the measurement changing the data stream thereby scrambling the key is just that, a theory. All fibers leak a percentage of light. If the light leakage does not scramble the key, then the reading of the leaked light that is no longer part of the data stream but does reflect the data will not change the initial data stream. A photo diode adsorbing a photon is no more or less a loss of that photon than a bit of black plastic sheathing material on the fiber.

So while I find the theory interesting, I also observe that theory does not over come the physical reality. This is why I chose the wording I prefer physics over meta physics.

It is easy to over think a problem. An interesting example, in the space race, it was found that in zero gravity a ball point pen ceases to work. America spent a million dollars developing a pressurized ball point pen to work in zero gravity. When one diplomat bragged about it to the Russians, the Russian just laughed and said “we just use pencils”.

I took that incident as a life lesson. But to give it a try at least, if I think of a quantum physic theory, and am able to prove it, it then becomes simply physics. Therefore the measurement of any quantum physic idea changes it so that it no longer is Quantum physics... How did I do? -grin-

So while I find the theory interesting, I also observe that theory does not overcome the physical reality. This is why I chose the wording I prefer physics over meta physics. .....

..... Therefore the measurement of any quantum physic idea changes it so that it no longer is Quantum physics... How did I do? -grin-

Fantastic! In one sentence you have disproved Planck, Heisenberg and many others! What were those bozos thinking? Quantum frauds (quads?) they are! Or were they just after government grants? Will we ever know or others will forever continue to perpetuate the quantum hoax?

You might appreciate this: Einstein on the Completeness of Quantum Theory

"Any sufficiently advanced technology is indistinguishable from magic" - Arthur C. Clarke's Third Law

"Any sufficiently advanced magic is indistinguishable from technology" - Corollary on Arthur C. Clarke's Third Law, often attributed to Larry Niven