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In order to make the quantum mechanics a closed theory one has to derive theBorn rule from the first principles, like the Schroedinger equation, ratherthan postulate it. The Born rule was in certain sense derived in severalarticles, e.g. in [D. Deutsch, Proc. R. Soc. Lond. A455, 3129 (1999)] and [W.H. Zurek, Phys. Rev. Lett. 90, 120404 (2003)]. In this work some arguments ofprevious authors are simplified and made more "physical". It is shown how toderive the Born rule using the conservation of quantum state norm$\langle\Psi|\Psi\rangle$ that is the unitary evolution property determined bythe Schroedinger equation. It is this property that makes the probability equalto the square of the amplitude modulus. We also present arguments in the spiritof the Many-World Interpretation to explain the origin of probabilisticbehavior. Simply speaking, the randomness appears as a result of representingthe wave function by using a detector of discrete nature that is found only inone state at a time, out of two or more possible states.

Derivation of the Born rule from the unitarity of quantum evolution