one subsystem cannot increase in mutual information with another subsystem, without (a) interacting with it and (b) doing thermodynamic work.
Remaining within thermodynamics, why do you need both condition (a) and condition (b)? From reading the article, I can see how you need to do thermodynamic work in order to know stuff about a system while not violating the second law in the process, but why do you also need actual interaction in order not to violate it? Or is (a) just a common-sense addition that isn’t actually implied by the second law?
Remaining within thermodynamics, why do you need both condition (a) and condition (b)? From reading the article, I can see how you need to do thermodynamic work in order to know stuff about a system while not violating the second law in the process, but why do you also need actual interaction in order not to violate it? Or is (a) just a common-sense addition that isn’t actually implied by the second law?