Given a quantum state, you can always tell me the entropy of that specific quantum state. It’s 0.
Only for pure states. Any system you have will be mixed.
I believe you mean “you will have incomplete information about any system you could really have.”
Operationally, it’s a distinction without a difference.
Since the way this whole nest of comments got started was whether it makes sense to identify entropy with incomplete information, I’d say my reply to you was made with loaded language :P
Only for pure states. Any system you have will be mixed.
I believe you mean “you will have incomplete information about any system you could really have.”
Operationally, it’s a distinction without a difference.
Since the way this whole nest of comments got started was whether it makes sense to identify entropy with incomplete information, I’d say my reply to you was made with loaded language :P