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The evident contrast between the time symmetry of fundamental microscopiclaws and the time asymmetry of macroscopic processes is a challenging physicalproblem. The observation of unitary evolution of a general physical system byan idealized observer whose recording and processing information is timeneutral is studied in a full information context. In the macroscopic limit, acontradiction between observations and predictions done at different timesappears. It implies that the observer cannot read records performed at timeswhen the entropy of the system is larger.

Information break of time symmetry in the macroscopic limit