[1]James Bell You don't know me, but with your quantum work you could
   benefit from an optical waveguide with a loss of less than 0.01
   db/kilometer. and possibly as low as 0.001 db/kilometer. I know you'll
   think that's impossible, but I know how to design it using low-Si-29
   silica, and low-Ge-73 germania. I believe that the typical residual
   loss of about 0.16 db/km is due almost entirely to Si-29 and Ge-73.
   Silicon-28 of isotopic purity of 99.995 is already available ("Silicon
   Kilogram Project"), and Germanium with much less than 0.1% Ge-73 could
   be made using a gas centrifuge. How would you like to do quantum
   communications over 5000 kilometers, from New York to London, for
   instance? You could...
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References

   1. https://www.facebook.com/JamesDaltonBell