Timeline for How does a state vector be projected onto an eigenspace after measurement
Current License: CC BY-SA 3.0
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| Oct 16, 2011 at 19:22 | comment | added | Ron Maimon | @David: the question is what is the projection operator you apply during a measurement. This projection operator is the same as the one that extracts the pure state of the particle entangled with the outgoing photon state, in the case of a photon measurement. If you make an ideal measurement on the photon, you get a non-ideal projection for the particle. You have to go far enough up on the chain of interactions so that the ideal measurement is a perfect approximation in order for the formalism of Copenhagen quantum mechanics (ideal measurements) to apply. | |
| Oct 16, 2011 at 17:16 | comment | added | David Z | I don't see how this actually answers the question, though... | |
| Oct 16, 2011 at 14:38 | comment | added | Mike Dunlavey | Nice explanation. | |
| Oct 16, 2011 at 11:36 | history | answered | Ron Maimon | CC BY-SA 3.0 |