Commit 91d81d55 authored by T. van der Sar's avatar T. van der Sar
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Update 6_backaction.md - learning goals

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After this lecture you will be able to:
- Do cool things
- Discuss the concept of quantum backaction
- Describe the time dynamics of a quantum state before and after a measurement
In this lecture, we will explore the concept of "quantum backaction", the idea in QM that measurement always induces some "action" on the state you are measuring.
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As a result of measurement, the mass will experience a random fluctuating force that increases with the strength of our measurement.
- This is called quantum backation force and the resulting noise in $\langle x(t) \rangle$ is called quantum backation noise, or sometimes collapse noise
- This is called quantum backaction force and the resulting noise in $\langle x(t) \rangle$ is called quantum backation noise, or sometimes collapse noise
**Caveat**: if we have complete information about the results of our measurements, this quantum backation noise is not random, and we can completely reconstruct it based on the measurement and thus predict how the mass will move! However, if some information is lost (perhaps in amplifier noise, or due to somebody else measuring and hiding their results) then this quantum backation noise will appear completely random to us.
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