How are units of measure defined in Quantum Mechanics?

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SUMMARY

Units of measure in Quantum Mechanics are defined similarly to classical physics, despite the inherent probabilistic nature of quantum systems. The discussion emphasizes that while classical definitions involve deterministic processes, quantum mechanics allows for the use of expected values without altering the fundamental definitions of units like the kilogram. The consensus is that the universe operates on quantum principles, yet standard units remain applicable and unchanged.

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In classical physics, the definition of a unit of measure involves a deterministic process (e.g. "the amount of force necessary to give a kilogram mass the acceleration of 1 meter per second square"). How are such units defined in Quantum Mechanics?

( Do we replace references to quantities with references to their expected values? )
 
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Units are defined the same. The universe is fundamentally quantum, but that doesn't stop us from defining (e.g.) the kilogram.
 

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