From: <agrayson2...@gmail.com <mailto:agrayson2...@gmail.com>>

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On Thursday, April 12, 2018 at 10:12:58 PM UTC, agrays...@gmail.com<mailto:agrays...@gmail.com> wrote:On Thursday, April 12, 2018 at 9:26:53 PM UTC, Brent wrote: On 4/12/2018 12:44 PM, agrays...@gmail.com wrote:*Let's simplify the model. Instead of a Nitrogen molecule, consider a free electron at rest in some frame. Its only degree of freedom is spin IIUC. Is it your claim that this electron become entangled with its environment via its spin WF, which is a superposition of UP and DN? Does this spin WF participate in the entanglement? TIA, AG*The electron's spin dof can only become entangled with the environment by an interaction with the environment. Brent Does that happen spontaneously, in the absence of a measurement? AGIf entanglement of a system with the environment requires measurement,and if virtually everything in the physical world is entangled withthe environment, aka "the world" -- which seems to be the prevailingbelief -- what concept of measurement do we need to explain this? AG

`As has been explained, entanglement is the consequence of any`

`interaction whatsoever. Measurement is just a particular kind of`

`interaction, one that is controlled and monitored, but otherwise not`

`special.`

`Consider a scattering interaction between two billiard balls. If you`

`know their initial momenta, and you know that momentum is conserved,`

`then because of the entanglement, if you measure the momentum of one`

`particle, you immediately know the momentum of the other, no matter how`

`far away it is (provided there have been no intervening interactions).`

`Entanglement is not just a quantum phenomenon, though quantum`

`entanglement does have some non-classical features. (Such as violating`

`the Bell inequalities.)`

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