Fundamental limits on quantum dynamics based on entropy change

Understand

It is well known in the realm of quantum mechanics and information theory that the entropy is non-decreasing for the class of unital physical processes.

• However, in general, the entropy does not exhibit monotonic behavior.
• This has restricted the use of entropy change in characterizing evolution processes.
• Recently, a lower bound on the entropy change was provided in the work of Buscemi, Das, and Wilde~[Phys.~Rev.~A~93(6),~062314~(2016)].