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Ch3 - Two Level System

Ch3 - Two Level System - Chapter 3 Two-state systems Spin...

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Two-state systems Chapter 3
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Spin states of an electron An electron is a spin ½ particle, which has only two values: / 2 ± = The particle carries (intrinsic) angular momentum and magnetic moment. A general internal state of an electron is described by 2 2 | | | | 1 α β + = ψ α β = ↑ + Remark: A full quantum state vector of an electron must include the external degree of freedom: ( ) , ( ) , dp p p p p α β Ψ = + Question: Under what conditions can we ignore the external part? http://www.upscale.utoronto.ca/GeneralInterest/Harrison/SternGerlach /SternGerlach.html
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