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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.
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Can the "conscious observer" be distinct from the "observed quantum system"?
While by no means a comprehensive answer to your question, in traditional QM theories such as the Copenhagen interpretation, the conscious observer is separate from the quantum system. In other words, …
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How can I conceptually interpret spin precession?
It’s essentially the same as when rotating objects precess. For objects which are actually spinning, there is some axis about which they spin. This axis is likewise described as the direction of the a …
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Why does the Heisenberg uncertainty principle apply to particles?
This might be a slightly naive question, and if so I apologize, but I am currently a little confused as to why the Heisenberg Uncertainty principle should apply to particles, i.e. our system (say an e …