Why does a quantum state collapse to an observer?

When we get a measured value of mechanical quantity, the corresponding state is the state of particles. After the particle is observed, it changes from the original superposition state to the later eigenstate and collapses.

In quantum mechanics, the motion state of microscopic particles is called quantum state.

Quantum states are characterized by a set of quantum numbers, which are equal to the degrees of freedom of particles. Scholars in the industry have raised different questions about this theory, such as Li Qichuan: "Einstein said: The real physical world should be simple. Describing quantum as a sphere is not an absolute model of classical quantum theory. The apparent model of physical theory tends to establish an understandable model, and the spherical model is just suitable for this situation.

Its foundation comes from the three-dimensional model of our space, and the sphere is the best embodiment of such a space. Ring quantum violates the base of such a space, so it is incomplete to describe it in topological space. Although this theory can explain many problems, it is not self-consistent.