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Message: <blockquote data-quote="djHiran" data-source="post: 12316545" data-attributes="member: 6429">But De Broglie-Bohm theory itself is non-local. If you try to marry this theory with relativity it leads to causal paradoxes. That may be why physicists do not prefer this theory much. However to say Copenhagen interpretation of quantum mechanics makes it non-deterministic is absurd. You might be assuming that the state of a physical system is somehow intrinsic to the system but not so natural to the theory we are using to describe it. If you buy that it can easily be shown that even Newtonian physics is non-deterministic! Why? If the state of the system is not a property of the theory, one might ask the position and acceleration of a particle are such and such, using that find the position after 5 seconds. Is it possible in classical framework? No! The state of the system MUST be defined in accordance with how the theory requires it.In quantum mechanics, the natural way to describe the state of the system is to specify the state vector or the wave function. That is the intrinsic way of describing a system completely in quantum mechanics. If you try to use the state of a system as defined in Newtonian framework together with quantum mechanics, then you are doing it wrong. Surely is quantum mechanics non-deterministic if you use the "wrong" state.On the other hand, given the initial state vector of a particle as required by quantum mechanics, QM is capable of predicting the state vector of the particle at a later time uniquely! But yes, that state is not what you are used to think of as the state in classical framework.Quantum mechanics is NOT a non-deterministic theory if you admit this. <img src="/styles/default/xenforo/smilies/default/happy.gif"  class="smilie" loading="lazy" alt=":)" title="Happy    :)" data-shortname=":)" /></blockquote>

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