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Physics/Question/Does Schrödinger's cat state exists?

Does Schrödinger's cat state exists?

I read a book that "The paradox of 'Schrödinger's Cat' has been solved". I learned a lot and I had many things I understood newly. In this book, a wonderful experiment that "Schrödinger's Cat State" was created by using laser light is introduced, but I thought that it is a misleading expression to name the state as "Schrödinger's Cat State". Between the state assumed by "Schrödinger's Cat" and the state of photons, there are parts that are the same, but some parts are thought to be different.

The photons that constitute "Schrödinger's Cat State" in this book do not interact each other to break the phase coherence. On the other hand, both the real living cat at room temperature and the cat which has died are breaking the state of superposition and breaking the phase coherence by the interaction of the particles which constitute these cats. I wonder if there is a big difference here. (It is a story similar to the thought experiment that is wondering what if the cat keeps crying in the soundproof box. The difference is whether the coherence is broken by the thermal vibration of its own with respect to each original state of superimposition. (But I do not want to imagine because I love cats ...)

In p78 of this book, "For example, even if one atom is placed on a table in some way, as soon as it is placed on the table, the wave function of the atom has been greatly disturbed, and the properties, as quantum mechanical properties of waves, are lost. In other words, it is impossible to create any superposition state." In terms of its reason, I think that it may not be able to maintain the state of superposition unless the cat's wave function has reached a temperature close to absolute zero. What is the condition of a cat living at absolute zero degree? (As another problem, it is interesting whether it is living or dead in such a state that quickly frozen goldfish, cockroaches and water bears cooled down to a considerably low temperature.)

I thought that this book may be a book to read under the premise that knows about it.

In such a context, it seems that it is impossible to describe objects (such as living cats) performing thermal vibrations only by superposition state in which quantum mechanical interference occurs. When the state vector evolves temporally under the Schrödinger equation quantum mechanically, I think that it deals with reversible change. I think that both the living cat and the cat which has died are changing with irreversible change (Entropy increasing? Time arrow problem?). Although,in the first place, it always seems that any living cat can not be described by reversible time development (within the Schrödinger equation) of superimposition of state vectors not considering the shrinkage of the wave packet by the cat themselves. But the state of "Schrödinger's cat" is seen in many textbook, also I always wonder "Where have I got wrong?".



The following is the information that has flowed on the Twitter timeline. I will study as a reference. Thank you very much.


















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