Three qubits can be entangled in two inequivalent ways

  title={Three qubits can be entangled in two inequivalent ways},
  author={Wolfgang Dur and Guifr{\'e} Vidal and Juan Ignacio Cirac},
  journal={Physical Review A},
Invertible local transformations of a multipartite system are used to define equivalence classes in the set of entangled states. This classification concerns the entanglement properties of a single copy of the state. Accordingly, we say that two states have the same kind of entanglement if both of them can be obtained from the other by means of local operations and classical communication (LOCC) with nonzero probability. When applied to pure states of a three-qubit system, this approach reveals… 

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