Distillation of multipartite entanglement by complementary stabilizer measurements

Details Distillation of multipartite entanglement by complementary stabilizer measurements Distillation of multipartite entanglement by complementary stabilizer measurements

2005-06-11

arxiv.org/abs/quant-ph/0506092v3

Phys. Rev. Lett. 95, 220501 (2005)

Physics

Quantum Physics

5 pages, 6 eps figures; final version

Scientific paper

10.1103/PhysRevLett.95.220501

We propose a scheme of multipartite entanglement distillation driven by a complementary pair of stabilizer measurements, to distill directly a wider range of states beyond the stabilizer code states (such as the Greenberger-Horne-Zeilinger states). We make our idea explicit by constructing a recurrence protocol for the 3-qubit W state. Noisy W states resulting from typical decoherence can be directly purified in a few steps, if their initial fidelity is larger than a threshold. For general input mixed states, we observe distillations to hierarchical fixed points, i.e., not only to the W state but also to the 2-qubit Bell pair, depending on their initial entanglement.

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