- #36
rubi
Science Advisor
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I wanted to distinguish between irreducible quantum uncertainty and experimental shortcomings such as systematic errors. I'm not an experimentalists, so I can't say much about it. ##\epsilon## is the precision of the measurement apparatus. In general, ##\epsilon > \sigma##, but if the experimeter has built an ideal device, then they should be almost equal.ShayanJ said:It seems to me that there is no difference between ## \epsilon ## and ## \sigma ##. Why do you use different names for them?
I said that after a measurement, the state will collapse onto ##P_A(S)\Psi## with associated uncertainty ##\epsilon_A##, but of course, this is an idealization. In general, you will have to take measurement theory into account and put more work into analyzing what the state and its uncertainty will be after a measurement.
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