Peter Fairbrother wrote: > I promised some links about the 5/6 cloning figure. You've had a few > experimental ones, here are some theory ones. has anyone with better number theory / probability skills than me taken a stab at exactly *how* accurate cloning would have to be (and how many clones you would need) to determine accurately both the bit and filter values for a quantum key exchange photon? for a single pass (5/6 photons output) it feels like the odds are stacked against getting a clean reading; for two passes (25/36) it feels even worse. how accurate would cloning need to be to get a better than 1/3 failure rate?

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