In quantum mechanics a system (e.g., a person) is represented by a \"state vecto

Question

In quantum mechanics a system (e.g., a person) is represented by
a "state vector" in Hilbert space that codes up the extent to which it
or he is in each of the many possible universes. A system's state
vector looks something like this: <1/10, 1/2,1/4, 1/20, etc...>, where the sum
of the entries is 1 and each entry indicates the probability that a
measurement (e.g., of position) will find the system in the state
corresponding to that slot. What would a system's state vector look
like right after a measurement is performed, and you have forced the
system to be in only one universe?

Explanation / Answer

Just after a measurement is performed the state vector of a system will look like <0,0,0....1,0,0,...0>

with entry 1 corresponding to the universe in to which the system is forced by measurement

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