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## Main Question or Discussion Point

When the electron's probability wave spreads out to a macroscopic size, what happens? How does it return to a microscopic spread in the future? Does the electron gain a new probability wave?

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When the electron's probability wave spreads out to a macroscopic size, what happens? How does it return to a microscopic spread in the future? Does the electron gain a new probability wave?

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Matterwave

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But anyways, according to SQT (not including decoherence) the electron's wave function will collapse instantaneously back to a very sharply peaked and narrow wave function once a measurement of its position is made by any observer. This is called wave function collapse, and is not yet quite well understood. I hear decoherence is solving that problem though...I'm not too familiar with decoherence.

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5.71 through 5.86 from this PDF http://www.physics.sfsu.edu/~greensit/book.pdf [Broken]

It never explains what happens to the electron when it's function spreads to macroscopic size.

It never explains what happens to the electron when it's function spreads to macroscopic size.

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DrChinese

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Any time a quantum particle is detected "here", logically it is NOT detected "there". It would be correct to say that "there" can be any possible history of the particle, including one in the distant future in a distant location. So a measurement here implies something about there, and vice versa.

If you think about it logically, the collapse of the wavefunction can be seen as defining quantum non-locality. Entanglement experiments are the usual way to see this, but it does not take 2 particles to have quantum non-locality.

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