Timeline for Does every interaction of quantum objects introduce backaction?
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| Dec 1, 2014 at 12:30 | comment | added | erik | I am aware of QND measurements, which don't work in this case where the position is not a constant of motion. Furthermore, as I understand this, QND measurements are still introducing perturbations on the object. The specialty is just that this perturbation does not influence the measured observable. E.g. a QND measurement of a resonators energy will still perturb its phase, but if carefully designed this perturbation will not change the energy. I probably should be more careful: I mean perturbation when I say back action. So is there any perturbation if I don't actively measure my photons? | |
| Dec 1, 2014 at 11:18 | history | answered | user56903 | CC BY-SA 3.0 |