From the phys.org article linked to: """ If the laws really are reversible, then what are the physical origins of the time-asymmetric entropy production that w

From the phys.org article linked to: """ If the laws really are reversible, then what are the physical origins of the time-asymmetric entropy production that we observe? The physicists explain that the answer to this question lies in the choice of the initial conditions. The microscopic laws allow reversible processes only because they begin with "a genuine equilibrium process for which the entropy production vanishes at all times," the scientists write in their paper. Preparing such an ideal initial state in a physical system is extremely complex, and the initial states of all observed processes aren't at "genuine equilibrium," which is why they lead to irreversible processes. Read more at: http://phys.org/news/2015-12-physicists-thermodynamic-irreversibility-quantum.html#jCp http://phys.org/news/2015-12-physicists-thermodynamic-irreve... """ ... This is a writeup of a writeup of a single paper that itself cautions about experimental conditions.