Multipartite entanglement in 2 x 2 x n quantum systems

Details Multipartite entanglement in 2 x 2 x n quantum systems Multipartite entanglement in 2 x 2 x n quantum systems

2003-07-09

arxiv.org/abs/quant-ph/0307067v3

Phys. Rev. A 69, 012101 (2004)

Physics

Quantum Physics

9 pages, 3 eps figures

Scientific paper

10.1103/PhysRevA.69.012101

We classify multipartite entangled states in the 2 x 2 x n (n >= 4) quantum system, for example the 4-qubit system distributed over 3 parties, under local filtering operations. We show that there exist nine essentially different classes of states, and they give rise to a five-graded partially ordered structure, including the celebrated Greenberger-Horne-Zeilinger (GHZ) and W classes of 3 qubits. In particular, all 2 x 2 x n-states can be deterministically prepared from one maximally entangled state, and some applications like entanglement swapping are discussed.

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