Who is this Mallory guy anyway?

[Matt Crawford]

> Well, that's the question - is Eve allowed to
> forward packets, in the act of listening, or
> is that the Mallory's job?  I don't know.

You can't measure a single-particle state without at least some chance 
of destroying the state.  (Even quantum non-demolition methods affect 
the measured system a bit.)  So you can't have a purely passive Eve.  
Perhaps "Quentin" is the Quantum Eavesdropper who makes his optimal 
tradeoff between gathering the most information and being the least 
detectable.

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