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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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Entanglement distance and quantum mechanics length scales

In this answer https://physics.stackexchange.com/a/9253/256311, the author said Usually, we think of quantum mechanics to govern the microscopic world, involving length scales of under a micrometer, …
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