> Even for isolated systems where, in principle, we could have zero surprisal and access to all possible information... This makes no sense. How could you hav

> Even for isolated systems where, in principle, we could have zero surprisal and access to all possible information... This makes no sense. How could you have access to "all possible information" in an isolated system? You obviously can't make any measurements, and if the system is prepared, then it's entangled with the system used to prepare it and again cannot be isolated. The whole notion of "an isolated system" is a theoretical fiction that doesn't actually exist in physical reality, but even in theory one cannot access all of the information in an isolated system because of the no-cloning theorem. So this really feels to me like the old joke about spherical chickens. Furthermore, this seems like an already-solved problem. Constructing classical reality requires copying classical information, and the only way to make that happen is to discard quantum information [1]. That is the source of the Second Law and the arrow of time [2]. [1] https://arxiv.org/abs/quant-ph/9512022 https://arxiv.org/abs/quant-ph/9512022 [2] https://blog.rongarret.info/2014/10/parallel-universes-and-arrow-of-time.html https://blog.rongarret.info/2014/10/parallel-universes-and-a...