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POVM and quantum information

  1. Jan 19, 2016 #1
    Hi everyone I need help understanding the lines on the attached picture.

    In the proof of corollary 14 how does it follow from corollary 13 that:

    Λ(X) = ∑li><il Tr[KijXKij]

    I think what has been done is take a partial trace over the system HB, but what exactly is the effect of this? It says that it is when the effect is not on the outcome measurement, so does the system carry information about the outcome of the measure while the system HA contains information about something else.

    Attached Files:

  2. jcsd
  3. Jan 21, 2016 #2


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    2017 Award

    Staff: Mentor

    Don't forget that ##H_B = ℂ## is one-dimensional in Cor. 14.
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