But if I make an observation, what is to determine which state I am in? This means that someone else has to observe me to collapse my wave function.

Michio Kaku
About This Quote

If you are to observe something, you have to collapse the wave function of the object you are observing. So, if I take a look at this person, what is to determine which state I am in? Is it true that I am in one state or another? Well, if observation collapses the wave function of an object then you have to go back to the original state AFTER observation. What happens after observation? The wave function collapses again. It collapses once more after another observation. So, this means that someone else has to collapse the wave function of the observer for him to collapse his own wave function.

Source: Parallel Worlds: A Journey Through Creation, Higher Dimensions, And The Future Of The Cosmos

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