- #1
munirah
- 31
- 0
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]
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]