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Why is quantum physics not deterministic?

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Quantum physics is perfectly deterministic ! But it is another kind of determinism: it is not on an individual basis i.e a “local determinism” like in classical physics (for just a single specific experiment). read more

Since quantum uncertainty doesn't appear to have much effect on many macroscopic classical variables such as whether or not I get into grad school, I would say that quantum mechanics is deterministic. Of course, it's still not fully deterministic in the same way as classical mechanics: if you measure the position of a particle, you cannot know what you'll get when you decide to measure the momentum afterward. read more

Quantum theory is non-deterministic in the sense that it works with objects ($\psi$ functions, kets) that can be used to calculate probabilities, not the actual results. It is the same as in statistical physics, only probabilistic statements can be derived. read more

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Quantum Mechanics, Determinism, Causality, and Particles ...
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