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I What is pure a eigenstate?

  1. Mar 19, 2017 #1
    what does it mean that a particle is a pure eigenstate?
    could someone explain this to me simply ?
  2. jcsd
  3. Mar 20, 2017 #2


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    Staff: Mentor

    You'll have to give some context as to where you read that.
  4. Mar 20, 2017 #3


    Staff: Mentor

    I have tried and tried to simply explain it failing every time.

    Here is the answer.

    States are positive operators of unit trace. States of the form |u><u| are called pure. States of the form ∑ pi |ui><ui| are called mixed. It can be shown all states are pure or mixed. If that is gibberish then sorry its the best I can do - explaining linear algebra in English is impossible.

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