- #1
amgo100
- 3
- 0
Homework Statement
Determine which qubits are entangled:
##|\psi\rangle=\frac{1}{2}(|000\rangle+i|010\rangle+i|101\rangle-|111\rangle)##
Homework Equations
The Attempt at a Solution
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My idea was to first calculate the density operator
##\rho = |\psi\rangle \langle\psi|##
and then find the partial trace over the second and the third qubit. Then from Schmidt rank I would know whether the first qubit is entangled with the rest of the system. Then I could repeat the procedure for the other qubits. However the result seams to be 0 and I don't even know how to interpret this result, nor how to find which of the three qubits are entangled.