A Special Case of a Thermodynamically Reversible Szilard Engine

Abstract

There is a special case in which a Szilard engine can be considered to be thermodynamically reversible if one of the boundary walls of the particle chamber of the Szilard engine is built out of the physicality of the information by which it functions in such a manner as to make the information by which it functions available to both sides of that boundary wall simultaneously.  In such a case, no energy needs to be input to erase information that would accumulate inside the engine because that information is already outside the engine, thus making such a Szilard engine thermodynamically reversible.