View source for Measurement

Measurement<ref>{{:Book/An introduction to measure theory}}</ref> is an action to [[Assessment|assess]] certain qualities or properties of a system or object. This is highly related to the notion of [[test]]. One of the most essential ideas in measurement is the notion of [[invariance]]. It means that measurement must be done against some non-changing unit or reference. This non-changing, or [[invariance|invariant]] requirement is a form of [[symmetry]]. Therefore, it is fair to say that all measurements must be conducted under some form of [[symmetries]].

=Measurement and Maxwell's Demon=
One can think of [[MxD|Maxwell's Demon(MxD)]] as a primitive form of measuring device. It provides two possible states that enable the observer or [[MxD]] to give a single bit of answer. In other words, every [[MxD]] is the measuring device for one bit of information in a given physical spacetime context.

=Quantum Measurements=
An introductory talk on quantum bits and measurements can be found here<ref>{{:Video/Qubits and Quantum States, Quantum Circuits, Measurements}}</ref>. All measurements can be defined in terms of [[logic model]]s.

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[[Category:Process]]
[[Category:Measurement]]
[[Category:Symmetry]]
[[Category:Invariance]]
[[Category:Assessment]]
[[Category:Verification]]
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