Local Conversion of Greenberger-Horne-Zeilinger States to Approximate W States

Details Local Conversion of Greenberger-Horne-Zeilinger States to Approximate W States Local Conversion of Greenberger-Horne-Zeilinger States to Approximate W States

2005-06-22

arxiv.org/abs/quant-ph/0506190v1

Phys. Rev. Lett. 94, 240501 (2005)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.240501

Genuine 3-qubit entanglement comes in two different inconvertible types represented by the Greenberger-Horne-Zeilinger (GHZ) state and the W state. We describe a specific method based on local positive operator valued measures and classical communication that can convert the ideal N-qubit GHZ state to a state arbitrarily close to the ideal N-qubit W state. We then experimentally implement this scheme in the 3-qubit case and characterize the input and the final state using 3-photon quantum state tomography.

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