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- Thread starter Rachel Lee Pierce
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All particles at all times are in a superposition of states. A measurement (often) changes the state, but it doesn't collapse it in some special irreversible way.

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Can you elaborate or back that up?All particles at all times are in a superposition of states. A measurement (often) changes the state, but it doesn't collapse it in some special irreversible way.

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A particle's state is essentially a vector. And, any vector can be expressed in any basis. You might say that something like the vector ##(1, 0, 0)## is special because it can be expressed as a single vector in the normal basis. Whereas the vector ##(1, 1, 0)## is the linear combination (superposition) of two basis vectors: ##(1, 1, 0) = (1, 0, 0) + (0, 1, 0)##.Can you elaborate or back that up?

But, if we look at these vectors in a different basis, then either or both are a linear combination of the basis vectors.

For example, if we take the simple vertical force of gravity, we can decompose it into the linear combination (superposition) of a force normal to an angled surface and a force tangential to the surface.

So, is gravity a single vertical vector or is it the linear combination of two other vectors? The answer is that at all times gravity has an infinite number of decompositions as a linear combination of any number of forces.

The same is true for the state of a particle. It is always a single state

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If you're here to learn about QM then fine. If you want to impose your own woolly ideas on QM, then your thead will probably get locked.

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Great. Thanks.If you're here to learn about QM then fine. If you want to impose your own woolly ideas on QM, then your thead will probably get locked.

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Thread closed for moderation.

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