what if a second "monitoring particle" (I don't know what type of particle that might be) were used and its state was affected somehow but the change in the entangled particle? Do the rules of observation/measurement apply in this case, since you would not be directly monitoring the particle in question, but perhaps an aspect of the "monitoring particle" that is not changed by observation? Just a thought from a guy who doesn't know all the rules involved in QM!
Adrian Tymes <email@example.com> wrote:
>> "Smigrodzki, Rafal" wrote:
>> ### Measuring a quantum property invariably changes it - so if you
>> want to monitor the spin of a single particle, you will actually
>> change it and destroy the entanglement. You might want to ask the
>> physicists on the list for a more detailed explanation but the ansible
>> is apparently not compatible with quantum mechanics as we know it.
>Hmm...yes, I can definitely see how that would be a problem. Would it
>be possible to make a "hidden" measurement, such that its information
>does not leave the vicinity of the quantum particle for a few moments,
>then affect the particle and do another measurement, then introduce the
>comparison between the two measurements to the outside world? The
>first measurement would have to be encoded into the quantum state for
>this to work without destroying the entanglement.
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