Russell, I finally found some confirmation of there being negative quantum (von Neumann) entropy for entangled systems:
http://en.wikipedia.org/wiki/Joint_quantum_entropy "The classical joint entropy is always at least equal to the entropy of each individual system. This is not the case for the joint quantum entropy. If the quantum state exhibits quantum entanglement, then the entropy of each subsystem may be larger than the joint entropy. This is equivalent to the fact that the conditional quantum entropy may be negative, while the classical conditional entropy may never be." and: "The classical joint entropy is always at least equal to the entropy of each individual system. This is not the case for the joint quantum entropy. If the quantum state exhibits quantum entanglement, then the entropy of each subsystem may be larger than the joint entropy. This is equivalent to the fact that the conditional quantum entropy may be negative, while the classical conditional entropy may never be." The joint quantum entropy S(A,B) can be used to define of the conditional quantum entropy: S(A|B)=S(A,B)-S(B) This is apparently a result of quantum theory's use of complex variables. I have not found a source to confirm this, except for that unfounded(pun intended) video. Richard -- You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/everything-list?hl=en.
