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Concurrence and three tangle

  1. Oct 21, 2016 #1
    Good day,

    May anyone help me to confirm the formula use for three tangle using concurrence.

    From my reading,

    three tangle,

    $$\tau=\tau_{A(BC)}-\tau_{AB}-\tau_{AC}$$

    and it can be related to concurrence

    $$\tau=C^2_{A(BC)}-C^2_{AB}-C^2_{AC}$$

    and I used formula for C is

    $$C^2=2-(Tr\rho^2_1+Tr\rho^2_2)$$ where $$\rho$$ is partial trace.
    [FONT=Georgia, Times New Roman, Times, serif]
    When I calculate the GHZ state, I get zero. It suppose
    [/FONT]$$\tau>0$$ for GHZ state and $$\tau=0$$ for W state
    [FONT=Georgia, Times New Roman, Times, serif]
    May I know, what it mean by the $$\tau$$ here. Please help me.

    And How I can calculated the density matrix of the state using three tangle. May anyone show me an example. I'm really stuck. Please help me.

    Thank you.
    [/FONT]

     
  2. jcsd
  3. Oct 26, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
  4. Oct 26, 2016 #3
    Thank you Greg Bernhardt. It is ok for this. I will make other question.
     
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