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**HedgeYourBets** · 09-10-2012, 10:24 AM

I was just trying to scribe a similar thing. I seem to be jumping between abstract hilbert space where superpositions can only exist and classical space where objective properties of objects can only exist. In my mind, and from prior discussions with you I can only objectify a photon in the classical realm when a measurement is undertaken and that property is only derived from the extraction of the properties the measuring device dictates from the original superposition. It seems to me that the measuring device is controlling things here and simply extracting what it wants and not necessarily recording accurately what it detects. I could extract a photon from a walrus in this manner if I was simply directing what information to take from the system.....anyway it's time for my pills :-))

By definition, a position measuring device is a macroscopic system whose state depends on the position eigenstates of the quantum system. Likewise, a momentum measuring device is a macroscopic system whose state depends on the momentum eigenstates of the quantum system. And the same is true for all other measurement variables. In other words, a measuring device selects the basis vectors simply because it is those basis vectors that lead to different macroscopic states.

09-10-2012, 10:24 AM	#42
HedgeYourBets Join Date Aug 2008 Posts 4,655 Senior Member	I was just trying to scribe a similar thing. I seem to be jumping between abstract hilbert space where superpositions can only exist and classical space where objective properties of objects can only exist. In my mind, and from prior discussions with you I can only objectify a photon in the classical realm when a measurement is undertaken and that property is only derived from the extraction of the properties the measuring device dictates from the original superposition. It seems to me that the measuring device is controlling things here and simply extracting what it wants and not necessarily recording accurately what it detects. I could extract a photon from a walrus in this manner if I was simply directing what information to take from the system.....anyway it's time for my pills :-)) By definition, a position measuring device is a macroscopic system whose state depends on the position eigenstates of the quantum system. Likewise, a momentum measuring device is a macroscopic system whose state depends on the momentum eigenstates of the quantum system. And the same is true for all other measurement variables. In other words, a measuring device selects the basis vectors simply because it is those basis vectors that lead to different macroscopic states.
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