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From the Quotation of the day mailing list, 2005-08-10:
(submitted to the mailing list by Terry Labach)"Even the most ignorant cannot know less than nothing. After all, negative information makes no sense. But, although this may be true in the everyday world we are accustomed to, negative information does exist in the quantum world....
"What could negative information possibly mean? In short, after I send you negative information, you will know less.... In the quantum world, we can (in some sense) know too much, and it is in these situations where one finds negative information. Negative information turns out to be precisely the right amount to cancel the fact that we know too much." -- Jonathan Oppenheim, a physicist at the University of Cambridge, in "Quantum information can be negative".
(no subject)
it's when you know things that are wrong.
not knowing the shape of the world is 0 information,
knowing it is flat is negative...
or it could be defined as not knowing that you don't know things, an absence of the knowledge of an absence. this is a bit closer to the physics sense, in which ignorance may or may not be useful.
(no subject)