From the phys.org article linked to:<p>&quot;&quot;&quot;
If the laws really are reversible, then what are the physical origins of the time-asymmetric entropy production that we observe?<p>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 &quot;a genuine equilibrium process for which the entropy production vanishes at all times,&quot; 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&#x27;t at &quot;genuine equilibrium,&quot; which is why they lead to irreversible processes.<p>Read more at: <a href="http:&#x2F;&#x2F;phys.org&#x2F;news&#x2F;2015-12-physicists-thermodynamic-irreversibility-quantum.html#jCp" rel="nofollow">http:&#x2F;&#x2F;phys.org&#x2F;news&#x2F;2015-12-physicists-thermodynamic-irreve...</a>
&quot;&quot;&quot;<p>... This is a writeup of a writeup of a single paper that itself cautions about experimental conditions.