Physics – Quantum Physics
Scientific paper
2008-01-10
Phys. Rev. A 77, 012305 (2008)
Physics
Quantum Physics
3 pages
Scientific paper
10.1103/PhysRevA.77.012305
We show that bipartite concurrence for rank-2 mixed states of qubits is written by an observable which can be exactly and directly measurable in experiment by local projective measurements, provided that four copies of the composite quantum system are available. In addition, for a tripartite quantum pure state of qubits, the 3-tangle is also shown to be measurable only by projective measurements on the reduced density matrices of a pair of qubits conditioned on four copies of the state.
Li Camille
Song He-shan
Yu Chang-shui
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