Space Forum / Astronomy / September 2005

The no-cloning theorem is misleading. I mean, yes you cannot clone
arbitrary quantum states perfectly, but you can clone arbitrary quantum
states approximately with good enough overlap fidelity among the clones.
This opens the door to presponse signal nonlocality. Gaussian continuous
variable states in particular can be effectively cloned. It may mean an
error in the Susskind-Hawking ideas about information recovery from
evaporating black holes that depends upon naive use of the no-cloning
theorem.