Local Conversion of Greenberger-Horne-Zeilinger States to Approximate W States
arXiv:quant-ph/0506190 · doi:10.1103/PhysRevLett.94.240501
Abstract
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.
4 pages, 3 figures